XIX. EDISON'S POURED CEMENT HOUSE

THE inventions that have been thus far described fall into two classes—first, those that were fundamental in the great arts and industries which have been founded and established upon them, and, second, those that have entered into and enlarged other arts that were previously in existence. On coming to consider the subject now under discussion, however, we find ourselves, at this writing, on the threshold of an entirely new and undeveloped art of such boundless possibilities that its ultimate extent can only be a matter of conjecture.

Edison's concrete house, however, involves two main considerations, first of which was the conception or creation of the IDEA—vast and comprehensive—of providing imperishable and sanitary homes for the wage-earner by molding an entire house in one piece in a single operation, so to speak, and so simply that extensive groups of such dwellings could be constructed rapidly and at very reasonable cost. With this idea suggested, one might suppose that it would be a simple matter to make molds and pour in a concrete mixture. Not so, however. And here the second consideration presents itself. An ordinary cement mixture is composed of crushed stone, sand, cement, and water. If such a mixture be poured into deep molds the heavy stone and sand settle to the bottom. Should the mixture be poured into a horizontal mold, like the floor of a house, the stone and sand settle, forming an ununiform mass. It was at this point that invention commenced, in order to produce a concrete mixture which would overcome this crucial difficulty. Edison, with characteristic thoroughness, took up a line of investigation, and after a prolonged series of experiments succeeded in inventing a mixture that upon hardening remained uniform throughout its mass. In the beginning of his experimentation he had made the conditions of test very severe by the construction of forms similar to that shown in the sketch below.

This consisted of a hollow wooden form of the dimensions indicated. The mixture was to be poured into the hopper until the entire form was filled, such mixture flowing down and along the horizontal legs and up the vertical members. It was to be left until the mixture was hard, and the requirement of the test was that there should be absolute uniformity of mixture and mass throughout. This was finally accomplished, and further invention then proceeded along engineering lines looking toward the devising of a system of molds with which practicable dwellings might be cast.

Edison's boldness and breadth of conception are well illustrated in his idea of a poured house, in which he displays his accustomed tendency to reverse accepted methods. In fact, it is this very reversal of usual procedure that renders it difficult for the average mind to instantly grasp the full significance of the principles involved and the results attained.

Up to this time we have been accustomed to see the erection of a house begun at the foundation and built up slowly, piece by piece, of solid materials: first the outer frame, then the floors and inner walls, followed by the stairways, and so on up to the putting on of the roof. Hence, it requires a complete rearrangement of mental conceptions to appreciate Edison's proposal to build a house FROM THE TOP DOWNWARD, in a few hours, with a freely flowing material poured into molds, and in a few days to take away the molds and find a complete indestructible sanitary house, including foundation, frame, floors, walls, stairways, chimneys, sanitary arrangements, and roof, with artistic ornamentation inside and out, all in one solid piece, as if it were graven or bored out of a rock.

To bring about the accomplishment of a project so extraordinarily broad involves engineering and mechanical conceptions of a high order, and, as we have seen, these have been brought to bear on the subject by Edison, together with an intimate knowledge of compounded materials.

The main features of this invention are easily comprehensible with the aid of the following diagrammatic sectional sketch:

It should be first understood that the above sketch is in broad outline, without elaboration, merely to illustrate the working principle; and while the upright structure on the right is intended to represent a set of molds in position to form a three-story house, with cellar, no regular details of such a building (such as windows, doors, stairways, etc.) are here shown, as they would only tend to complicate an explanation.

It will be noted that there are really two sets of molds, an inside and an outside set, leaving a space between them throughout. Although not shown in the sketch, there is in practice a number of bolts passing through these two sets of molds at various places to hold them together in their relative positions. In the open space between the molds there are placed steel rods for the purpose of reinforcement; while all through the entire structure provision is made for water and steam pipes, gas-pipes and electric-light wires being placed in appropriate positions as the molds are assembled.

At the centre of the roof there will be noted a funnel-shaped opening. Into this there is delivered by the endless chain of buckets shown on the left a continuous stream of a special free-flowing concrete mixture. This mixture descends by gravity, and gradually fills the entire space between the two sets of molds. The delivery of the material—or "pouring," as it is called—is continued until every part of the space is filled and the mixture is even with the tip of the roof, thus completing the pouring, or casting, of the house. In a few days afterward the concrete will have hardened sufficiently to allow the molds to be taken away leaving an entire house, from cellar floor to the peak of the roof, complete in all its parts, even to mantels and picture molding, and requiring only windows and doors, plumbing, heating, and lighting fixtures to make it ready for habitation.

In the above sketch the concrete mixers, A, B, are driven by the electric motor, C. As the material is mixed it descends into the tank, D, and flows through a trough into a lower tank, E, in which it is constantly stirred, and from which it is taken by the endless chain of buckets and dumped into the funnel-shaped opening at the top of the molds, as above described.

The molds are made of cast-iron in sections of such size and weight as will be most convenient for handling, mostly in pieces not exceeding two by four feet in rectangular dimensions. The subjoined sketch shows an exterior view of several of these molds as they appear when bolted together, the intersecting central portions representing ribs, which are included as part of the casting for purposes of strength and rigidity.

The molds represented above are those for straight work, such as walls and floors. Those intended for stairways, eaves, cornices, windows, doorways, etc., are much more complicated in design, although the same general principles are employed in their construction.

While the philosophy of pouring or casting a complete house in its entirety is apparently quite simple, the development of the engineering and mechanical questions involves the solution of a vast number of most intricate and complicated problems covering not only the building as a whole, but its numerous parts, down to the minutest detail. Safety, convenience, duration, and the practical impossibility of altering a one-piece solid dwelling are questions that must be met before its construction, and therefore Edison has proceeded calmly on his way toward the goal he has ever had clearly in mind, with utter indifference to the criticisms and jeers of those who, as "experts," have professed positive knowledge of the impossibility of his carrying out this daring scheme.





LIST OF UNITED STATES PATENTS

List of United States patents granted to Thomas A. Edison, arranged
according to dates of execution of applications for such patents. This
list shows the inventions as Mr. Edison has worked upon them from year
to year

   1868

   NO.         TITLE OF PATENT DATE EXECUTED                    DATE EXECUTED
   90,646,     Electrographic Vote Recorder . . . . .Oct. 13, 1868

   1869

   91,527      Printing Telegraph (reissued October
               25, 1870, numbered 4166, and August
               5, 1873, numbered 5519). . . . . . . .Jan. 25, 1869
   96,567      Apparatus for Printing Telegraph (reissued
               February 1, 1870, numbered
               3820). . . . . . . . . . . . . . . . .Aug. 17, 1869
   96,681      Electrical Switch for Telegraph Apparatus Aug. 27, 1869
   102,320     Printing Telegraph—Pope and Edison
               (reissued April 17, 1877, numbered
               7621, and December 9, 1884, numbered
               10,542). . . . . . . . . . . . . . . Sept. 16, 1869
   103,924     Printing Telegraphs—Pope and Edison
               (reissued August 5, 1873)

   1870

   103,035     Electromotor Escapement. . . . . . . . Feb. 5, 1870
   128,608     Printing Telegraph Instruments . . . . .May 4, 1870
   114,656     Telegraph Transmitting Instruments . .June 22, 1870
   114,658     Electro Magnets for Telegraph
               Instruments. . . . . . . . . . . . . .June 22, 1870
   114,657     Relay Magnets for Telegraph
               Instruments. . . . . . . . . . . . . .Sept. 6, 1870
   111,112     Electric Motor Governors . . . . . . .June 29, 1870
   113,033     Printing Telegraph Apparatus . . . . .Nov. 17, 1870

   1871

   113,034     Printing Telegraph Apparatus . . . . .Jan. 10, 1871
   123,005     Telegraph Apparatus. . . . . . . . . .July 26, 1871
   123,006     Printing Telegraph . . . . . . . . . .July 26, 1871
   123,984     Telegraph Apparatus. . . . . . . . . .July 26, 1871
   124,800     Telegraphic Recording Instruments. . .Aug. 12, 1871
   121,601     Machinery for Perforating Paper for
               Telegraph Purposes . . . . . . . . . .Aug. 16, 1871
   126,535     Printing Telegraphs. . . . . . . . . .Nov. 13, 1871
   133,841     Typewriting Machine. . . . . . . . . .Nov. 13, 1871

   1872
   126,532     Printing Telegraphs. . . . . . . . . . .Jan. 3 1872
   126,531     Printing Telegraphs. . . . . . . . . .Jan. 17, 1872
   126,534     Printing Telegraphs. . . . . . . . . .Jan. 17, 1872
   126,528     Type Wheels for Printing Telegraphs. .Jan. 23, 1872
   126,529     Type Wheels for Printing Telegraphs. .Jan. 23, 1872
   126,530     Printing Telegraphs. . . . . . . . . .Feb. 14, 1872
   126,533     Printing Telegraphs. . . . . . . . . .Feb. 14, 1872
   132,456     Apparatus for Perforating Paper for
               Telegraphic Use. . . . . . . . . . . March 15, 1872
   132,455     Improvement in Paper for Chemical
               Telegraphs . . . . . . . . . . . . . April 10, 1872
   133,019     Electrical Printing Machine. . . . . April 18, 1872
   128,131     Printing Telegraphs. . . . . . . . . April 26, 1872
   128,604     Printing Telegraphs. . . . . . . . . April 26, 1872
   128,605     Printing Telegraphs. . . . . . . . . April 26, 1872
   128,606     Printing Telegraphs. . . . . . . . . April 26, 1872
   128,607     Printing Telegraphs. . . . . . . . . April 26, 1872
   131,334     Rheotomes or Circuit Directors . . . . .May 6, 1872
   134,867     Automatic Telegraph Instruments. . . . .May 8, 1872
   134,868     Electro Magnetic Adjusters . . . . . . .May 8, 1872
   130,795     Electro Magnets. . . . . . . . . . . . .May 9, 1872
   131,342     Printing Telegraphs. . . . . . . . . . .May 9, 1872
   131,341     Printing Telegraphs. . . . . . . . . . May 28, 1872
   131,337     Printing Telegraphs. . . . . . . . . .June 10, 1872
   131,340     Printing Telegraphs. . . . . . . . . .June 10, 1872
   131,343     Transmitters and Circuits for Printing
               Telegraph. . . . . . . . . . . . . . .June 10, 1872
   131,335     Printing Telegraphs. . . . . . . . . .June 15, 1872
   131,336     Printing Telegraphs. . . . . . . . . .June 15, 1872
   131,338     Printing Telegraphs. . . . . . . . . .June 29, 1872
   131,339     Printing Telegraphs. . . . . . . . . .June 29, 1872
   131,344     Unison Stops for Printing Telegraphs .June 29, 1872
   134,866     Printing and Telegraph Instruments . .Oct. 16, 1872
   138,869     Printing Telegraphs. . . . . . . . . .Oct. 16, 1872
   142,999     Galvanic Batteries . . . . . . . . . .Oct. 31, 1872
   141,772     Automatic or Chemical Telegraphs . . . Nov. 5, 1872
   135,531     Circuits for Chemical Telegraphs . . . Nov. 9, 1872
   146,812     Telegraph Signal Boxes . . . . . . . .Nov. 26, 1872
   141,773     Circuits for Automatic Telegraphs. . .Dec. 12, 1872
   141,776     Circuits for Automatic Telegraphs. . .Dec. 12, 1872
   150,848     Chemical or Automatic Telegraphs . . .Dec. 12, 1872
   1873

   139,128     Printing Telegraphs. . . . . . . . . .Jan. 21, 1873
   139,129     Printing Telegraphs. . . . . . . . . .Feb. 13, 1873
   140,487     Printing Telegraphs. . . . . . . . . .Feb. 13, 1873
   140,489     Printing Telegraphs. . . . . . . . . .Feb. 13, 1873
   138,870     Printing Telegraphs. . . . . . . . . .March 7, 1873
   141,774     Chemical Telegraphs. . . . . . . . . .March 7, 1873
   141,775     Perforator for Automatic Telegraphs. .March 7, 1873
   141,777     Relay Magnets. . . . . . . . . . . . .March 7, 1873
   142,688     Electric Regulators for Transmitting
              Instruments . . . . . . . . . . . . . .March 7, 1873
   156,843     Duplex Chemical Telegraphs . . . . . .March 7, 1873
   147,312     Perforators for Automatic Telegraphy March 24, 1873
   147,314     Circuits for Chemical Telegraphs . . March 24, 1873
   150,847     Receiving Instruments for Chemical
               Telegraphs . . . . . . . . . . . . . March 24, 1873
   140,488     Printing Telegraphs. . . . . . . . . April 23, 1873
   147,311     Electric Telegraphs. . . . . . . . . April 23, 1873
   147,313     Chemical Telegraphs. . . . . . . . . April 23, 1873
   147,917     Duplex Telegraphs. . . . . . . . . . April 23, 1873
   150,846     Telegraph Relays . . . . . . . . . . April 23, 1873
   160,405     Adjustable Electro Magnets for
               Relays, etc. . . . . . . . . . . . . April 23, 1873
   162,633     Duplex Telegraphs. . . . . . . . . . April 22, 1873
   151,209     Automatic Telegraphy and Perforators
               Therefor . . . . . . . . . . . . . . .Aug. 25, 1873
   160,402     Solutions for Chemical Telegraph PaperSept. 29, 1873
   160,404     Solutions for Chemical Telegraph PaperSept. 29, 1873
   160,580     Solutions for Chemical Telegraph PaperOct. 14, 1873
   160,403     Solutions for Chemical Telegraph PaperOct. 29, 1873

   1874
   154,788     District Telegraph Signal Box. . . . .April 2, 1874
   168,004     Printing Telegraph . . . . . . . . . . May 22, 1874
   166,859     Chemical Telegraphy. . . . . . . . . . June 1, 1874
   166,860     Chemical Telegraphy. . . . . . . . . . June 1, 1874
   166,861     Chemical Telegraphy. . . . . . . . . . June 1, 1874
   158,787     Telegraph Apparatus. . . . . . . . . . Aug. 7, 1874
   172,305     Automatic Roman Character
               Telegraph. . . . . . . . . . . . . . . Aug. 7, 1874
   173,718     Automatic Telegraphy . . . . . . . . . Aug. 7, 1874
   178,221     Duplex Telegraphs. . . . . . . .      Aug. 19, 1874
   178,222     Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
   178,223     Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
   180,858     Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
   207,723     Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
   480,567     Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
   207,724     Duplex Telegraphs. . . . . . . . . . .Dec. 14, 1874
   1875

   168,242     Transmitter and Receiver for Automatic
               Telegraph. . . . . . . . . . . . . . .Jan. 18, 1875
   168,243     Automatic Telegraphs . . . . . . . . .Jan. 18, 1875
   168,385     Duplex Telegraphs. . . . . . . . . . .Jan. 18, 1875
   168,466     Solution for Chemical Telegraphs . . .Jan. 18, 1875
   168,467     Recording Point for Chemical Telegraph Jan. 18, 1875
   195,751     Automatic Telegraphs . . . . . . . . . Jan. 18 1875
   195,752     Automatic Telegraphs . . . . . . . . .Jan. 19, 1875
   171,273     Telegraph Apparatus. . . . . . . . . . Feb 11, 1875
   169,972     Electric Signalling Instrument . . . . Feb 24, 1875
   209,241     Quadruplex Telegraph Repeaters (reissued
               September 23, 1879, numbered
               8906). . . . . . . . . . . . . . . . . Feb 24, 1875

   1876

   180,857     Autographic Printing . . . . . . . . .March 7, 1876
   198,088     Telephonic Telegraphs. . . . . . . . .April 3, 1876
   198,089     Telephonic or Electro Harmonic
               Telegraphs . . . . . . . . . . . . . .April 3, 1876
   182,996     Acoustic Telegraphs. . . . . . . . . . .May 9, 1876
   186,330     Acoustic Electric Telegraphs . . . . . .May 9, 1876
   186,548     Telegraph Alarm and Signal Apparatus . .May 9, 1876
   198,087     Telephonic Telegraphs. . . . . . . . . .May 9, 1876
   185,507     Electro Harmonic Multiplex Telegraph .Aug. 16, 1876
   200,993     Acoustic Telegraph . . . . . . . . . .Aug. 26, 1876
   235,142     Acoustic Telegraph . . . . . . . . . .Aug. 26, 1876
   200,032     Synchronous Movements for Electric
               Telegraphs . . . . . . . . . . . . . .Oct. 30, 1876
   200,994     Automatic Telegraph Perforator and
               Transmitter. . . . . . . . . . . . . .Oct. 30, 1876

   1877
   205,370     Pneumatic Stencil Pens . . . . . . . . Feb. 3, 1877
   213,554     Automatic Telegraphs . . . . . . . . . Feb. 3, 1877
   196,747     Stencil Pens . . . . . . . . . . . . April 18, 1877
   203,329     Perforating Pens . . . . . . . . . . April 18, 1877
   474,230     Speaking Telegraph . . . . . . . . . April 18, 1877
   217,781     Sextuplex Telegraph. . . . . . . . . . .May 8, 1877
   230,621     Addressing Machine . . . . . . . . . . .May 8, 1877
   377,374     Telegraphy . . . . . . . . . . . . . . .May 8, 1877
   453,601     Sextuplex Telegraph. . . . . . . . . . May 31, 1877
   452,913     Sextuplex Telegraph. . . . . . . . . . May 31, 1877
   512,872     Sextuplex Telegraph. . . . . . . . . . May 31, 1877
   474,231     Speaking Telegraph . . . . . . . . . . July 9, 1877
   203,014     Speaking Telegraph . . . . . . . . . .July 16, 1877
   208,299     Speaking Telegraph . . . . . . . . . .July 16, 1877
   203,015     Speaking Telegraph . . . . . . . . . .Aug. 16, 1877
   420,594     Quadruplex Telegraph . . . . . . . . .Aug. 16, 1877
   492,789     Speaking Telegraph . . . . . . . . . .Aug. 31, 1877
   203,013     Speaking Telegraph . . . . . . . . . . Dec. 8, 1877
   203 018     Telephone or Speaking Telegraph. . . . Dec. 8, 1877
   200 521     Phonograph or Speaking Machine . . . .Dec. 15, 1877

   1878

   203,019     Circuit for Acoustic or Telephonic
               Telegraphs . . . . . . . . . . . . . .Feb. 13, 1878
   201,760     Speaking Machines. . . . . . . . . . .Feb. 28, 1878
   203,016     Speaking Machines. . . . . . . . . . .Feb. 28, 1878
   203,017     Telephone Call Signals . . . . . . . .Feb. 28, 1878
   214,636     Electric Lights. . . . . . . . . . . . Oct. 5, 1878
   222,390     Carbon Telephones. . . . . . . . . . . Nov. 8, 1878
   217,782     Duplex Telegraphs. . . . . . . . . . .Nov. 11, 1878
   214,637     Thermal Regulator for Electric Lights.Nov. 14, 1878
   210,767     Vocal Engines. . . . . . . . . . . . .Aug. 31, 1878
   218,166     Magneto Electric Machines. . . . . . . Dec. 3, 1878
   218,866     Electric Lighting Apparatus. . . . . . Dec. 3, 1878
   219,628     Electric Lights. . . . . . . . . . . . Dec. 3, 1878
   295,990     Typewriter . . . . . . . . . . . . . . Dec. 4, 1878
   218,167     Electric Lights. . . . . . . . . . . .Dec. 31, 1878

   1879

   224,329     Electric Lighting Apparatus. . . . . .Jan. 23, 1879
   227,229     Electric Lights. . . . . . . . . . . .Jan. 28, 1879
   227,227     Electric Lights. . . . . . . . . . . . Feb. 6, 1879
   224.665     Autographic Stencils for Printing. . March 10, 1879
   227.679     Phonograph . . . . . . . . . . . . . March 19, 1879
   221,957     Telephone. . . . . . . . . . . . . . March 24, 1879
   227,229     Electric Lights. . . . . . . . . . . April 12, 1879
   264,643     Magneto Electric Machines. . . . . . April 21, 1879
   219,393     Dynamo Electric Machines . . . . . . . July 7, 1879
   231,704     Electro Chemical Receiving Telephone .July 17, 1879
   266,022     Telephone. . . . . . . . . . . . . . . Aug. 1, 1879
   252,442     Telephone. . . . . . . . . . . . . . . Aug. 4, 1879
   222,881     Magneto Electric Machines. . . . . . .Sept. 4, 1879
   223,898     Electric Lamp. . . . . . . . . . . . . Nov. 1, 1879

   1880

   230,255     Electric Lamps . . . . . . . . . . . .Jan. 28, 1880
   248,425     Apparatus for Producing High Vacuums Jan.28 1880
   265,311     Electric Lamp and Holder for Same. . . Jan. 28 1880
   369,280     System of Electrical Distribution. . .Jan. 28, 1880
   227,226     Safety Conductor for Electric Lights .March 10,1880
   228,617     Brake for Electro Magnetic Motors. . March 10, 1880
   251,545     Electric Meter . . . . . . . . . . . March 10, 1880
   525,888     Manufacture of Carbons for Electric
               Lamps. . . . . . . . . . . . . . . . March 10, 1880
   264,649     Dynamo or Magneto Electric Machines. March 11,
   1880
   228,329     Magnetic Ore Separator . . . . . . . .April 3, 1880
   238,868     Manufacture of Carbons for Incandescent
               Electric Lamps . . . . . . . . . . . April 25, 1880
   237,732     Electric Light . . . . . . . . . . . .June 15, 1880
   248,417     Manufacturing Carbons for Electric
               Lights . . . . . . . . . . . . . . . .June 15, 1880
   298,679     Treating Carbons for Electric Lights .June 15, 1880
   248,430     Electro Magnetic Brake . . . . . . . . July 2, 1880
   265,778     Electro Magnetic Railway Engine. . . . July 3, 1880
   248,432     Magnetic Separator . . . . . . . . . .July 26, 1880
   239,150     Electric Lamp. . . . . . . . . . . . .July 27, 1880
   239,372     Testing Electric Light Carbons—Edison
               and Batchelor. . . . . . . . . . . . .July 28, 1880
   251,540     Carbon Electric Lamps. . . . . . . . .July 28, 1880
   263,139     Manufacture of Carbons for Electric
               Lamps. . . . . . . . . . . . . . . . .July 28, 1880
   434,585     Telegraph Relay. . . . . . . . . . . .July 29, 1880
   248 423     Carbonizer . . . . . . . . . . . . . .July 30, 1880
   263 140     Dynamo Electric Machines . . . . . . .July 30, 1880
   248,434     Governor for Electric Engines. . . . .July 31, 1880
   239,147     System of Electric Lighting. . . . . .July 31, 1880
   264,642     Electric Distribution and Translation
               System . . . . . . . . . . . . . . . . Aug. 4, 1880
   293,433     Insulation of Railroad Tracks used for
               Electric Circuits. . . . . . . . . . . Aug. 6, 1880
   239,373     Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
   239,745     Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
   263,135     Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
   251,546     Electric Lamp. . . . . . . . . . . . .Aug. 10, 1880
   239,153     Electric Lamp. . . . . . . . . . . . .Aug. 11, 1880
   351,855     Electric Lamp. . . . . . . . . . . . .Aug. 11, 1880
   248,435     Utilizing Electricity as Motive Power.Aug. 12, 1880
   263,132     Electro Magnetic Roller. . . . . . . .Aug. 14, 1880
   264,645     System of Conductors for the Distribution
               of Electricity . . . . . . . . . . . .Sept. 1, 1880
   240,678     Webermeter . . . . . . . . . . . . . Sept. 22, 1880
   239,152     System of Electric Lighting. . . . . .Oct. 14, 1880
   239,148     Treating Carbons for Electric Lights .Oct. 15, 1880
   238,098     Magneto Signalling Apparatus—Edison
               and Johnson. . . . . . . . . . . . . .Oct. 21, 1880
   242,900     Manufacturing Carbons for Electric
               Lamps. . . . . . . . . . . . . . . . .Oct. 21, 1880
   251,556     Regulator for Magneto or Dynamo
               Electric Machines. . . . . . . . . . .Oct. 21, 1880
   248,426     Apparatus for Treating Carbons for
               Electric Lamps . . . . . . . . . . . . Nov. 5, 1880
   239,151     Forming Enlarged Ends on Carbon
               Filaments. . . . . . . . . . . . . . .Nov. 19, 1880
   12,631      Design Patent—Incandescent Electric
               Lamp . . . . . . . . . . . . . . . . .Nov. 23, 1880
   239,149     Incandescing Electric Lamp . . . . . . Dec. 3, 1880
   242,896     Incandescent Electric Lamp . . . . . . Dec. 3, 1880
   242,897     Incandescent Electric Lamp . . . . . . Dec. 3, 1880
   248,565     Webermeter . . . . . . . . . . . . . . Dec. 3, 1880
   263,878     Electric Lamp. . . . . . . . . . . . . Dec. 3, 1880
   239,154     Relay for Telegraphs . . . . . . . . .Dec. 11, 1880
   242,898     Dynamo Electric Machine. . . . . . . .Dec. 11, 1880
   248,431     Preserving Fruit . . . . . . . . . . .Dec. 11, 1880
   265,777     Treating Carbons for Electric Lamps. .Dec. 11, 1880
   239,374     Regulating the Generation of Electric
               Currents . . . . . . . . . . . . . . .Dec. 16, 1880
   248,428     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Dec. 16, 1880
   248,427     Apparatus for Treating Carbons for
               Electric Lamps . . . . . . . . . . . .Dec. 21, 1880
   248,437     Apparatus for Treating Carbons for
               Electric Lamps . . . . . . . . . . . .Dec. 21, 1880
   248,416     Manufacture of Carbons for Electric
               Lights . . . . . . . . . . . . . . . .Dec. 30, 1880

   1881

   242,899     Electric Lighting. . . . . . . . . . .Jan. 19, 1881
   248,418     Electric Lamp. . . . . . . . . . . . . Jan. 19 1881
   248,433     Vacuum Apparatus . . . . . . . . . . . Jan. 19 1881
   251,548     Incandescent Electric Lamps. . . . . .Jan. 19, 1881
   406,824     Electric Meter . . . . . . . . . . . .Jan. 19, 1881
   248,422     System of Electric Lighting. . . . . .Jan. 20, 1881
   431,018     Dynamo or Magneto Electric Machine . . Feb. 3, 1881
   242,901     Electric Motor . . . . . . . . . . . .Feb. 24, 1881
   248,429     Electric Motor . . . . . . . . . . . .Feb. 24, 1881
   248,421     Current Regulator for Dynamo Electric
               Machine. . . . . . . . . . . . . . . .Feb. 25, 1881
   251,550     Magneto or Dynamo Electric Machines. .Feb. 26, 1881
   251,555     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Feb. 26, 1881
   482,549     Means for Controlling Electric
               Generation . . . . . . . . . . . . . .March 2, 1881
   248,420     Fixture and Attachment for Electric
               Lamps. . . . . . . . . . . . . . . . .March 7, 1881
   251,553     Electric Chandeliers . . . . . . . . .March 7, 1881
   251,554     Electric Lamp and Socket or Holder . .March 7, 1881
   248,424     Fitting and Fixtures for Electric
               Lamps. . . . . . . . . . . . . . . . .March 8, 1881
   248,419     Electric Lamp. . . . . . . . . . . . March 30, 1881
   251,542     System of Electric Light . . . . . . April 19, 1881
   263,145     Making Incandescents . . . . . . . . April 19, 1881
   266,447     Electric Incandescent Lamp . . . . . April 21, 1881
   251,552     Underground Conductors . . . . . . . April 22, 1881
   476,531     Electric Lighting System . . . . . . April 22, 1881
   248,436     Depositing Cell for Plating the Connections
               of Electric Lamps. . . . . . . . . . . May 17, 1881
   251,539     Electric Lamp. . . . . . . . . . . . . May 17, 1881
   263,136     Regulator for Dynamo or Magneto
               Electric Machine . . . . . . . . . . . May 17, 1881
   251,557     Webermeter . . . . . . . . . . . . . . May 19, 1881
   263,134     Regulator for Magneto Electric
               Machine. . . . . . . . . . . . . . . . May 19, 1881
   251,541     Electro Magnetic Motor . . . . . . . . May 20, 1881
   251,544     Manufacture of Electric Lamps. . . . . May 20, 1881
   251,549     Electric Lamp and the Manufacture
               thereof. . . . . . . . . . . . . . . . May 20, 1881
   251,558     Webermeter . . . . . . . . . . . . . . May 20, 1881
   341,644     Incandescent Electric Lamp . . . . . . May 20, 1881
   251,551     System of Electric Lighting. . . . . . May 21, 1881
   263,137     Electric Chandelier. . . . . . . . . . May 21, 1881
   263,141     Straightening Carbons for Incandescent
               Lamps. . . . . . . . . . . . . . . . . May 21, 1881
   264,657     Incandescent Electric Lamps. . . . . . May 21, 1881
   251,543     Electric Lamp. . . . . . . . . . . . . May 24, 1881
   251,538     Electric Light . . . . . . . . . . . . May 27, 1881
   425,760     Measurement of Electricity in Distribution
               System . . . . . . . . . . . . . . . .May 3 1, 1881
   251,547     Electrical Governor. . . . . . . . . . June 2, 1881
   263,150     Magneto or Dynamo Electric Machines. June 3, 1881
   263,131     Magnetic Ore Separator . . . . . . . . June 4, 1881
   435,687     Means for Charging and Using Secondary
               Batteries. . . . . . . . . . . . . . .June 21, 1881
   263,143     Magneto or Dynamo Electric Machines. .June 24, 1881
   251,537     Dynamo Electric Machine. . . . . . . .June 25, 1881
   263,147     Vacuum Apparatus . . . . . . . . . . .July 1, 188 1
   439,389     Electric Lighting System . . . . . . . July 1, 1881
   263,149     Commutator for Dynamo or Magneto
               Electric Machines. . . . . . . . . . .July 22, 1881
   479,184     Facsimile Telegraph—Edison and Kenny.July 26, 1881
   400,317     Ore Separator. . . . . . . . . . . . .Aug. 11, 1881
   425,763     Commutator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Aug. 20, 1881
   263,133     Dynamo or Magneto Electric Machine . .Aug. 24, 1881
   263,142     Electrical Distribution System . . . .Aug. 24, 1881
   264,647     Dynamo or Magneto Electric Machines. .Aug. 24, 1881
   404,902     Electrical Distribution System . . . .Aug. 24, 1881
   257,677     Telephone. . . . . . . . . . . . . . .Sept. 7, 1881
   266,021     Telephone. . . . . . . . . . . . . . .Sept. 7, 1881
   263,144     Mold for Carbonizing Incandescents . Sept. 19, 1881
   265,774     Maintaining Temperatures in
               Webermeters. . . . . . . . . . . . . Sept. 21, 1881
   264,648     Dynamo or Magneto Electric Machines. Sept. 23, 1881
   265,776     Electric Lighting System . . . . . . Sept. 27, 1881
   524,136     Regulator for Dynamo Electrical
               Machines . . . . . . . . . . . . . . Sept. 27, 1881
   273,715     Malleableizing Iron. . . . . . . . . . Oct. 4, 1881
   281,352     Webermeter . . . . . . . . . . . . . . Oct. 5, 1881
   446,667     Locomotives for Electric Railways. . .Oct. 11, 1881
   288,318     Regulator for Dynamo or Magneto
               Electric Machines. . . . . . . . . . .Oct. 17, 1881
   263,148     Dynamo or Magneto Electric Machines. Oct. 25, 1881
   264,646     Dynamo or Magneto Electric Machines. Oct. 25, 1881
   251,559     Electrical Drop Light. . . . . . . . .Oct. 25, 1881
   266,793     Electric Distribution System . . . . .Oct. 25, 1881
   358,599     Incandescent Electric Lamp . . . . . .Oct. 29, 1881
   264,673     Regulator for Dynamo Electric Machine. Nov. 3, 1881
   263,138     Electric Arc Light . . . . . . . . . . Nov. 7, 1881
   265,775     Electric Arc Light . . . . . . . . . . .Nov. 7 1881
   297,580     Electric Arc Light . . . . . . . . . . .Nov. 7 1881
   263,146     Dynamo Magneto Electric Machines . . .Nov. 22, 1881
   266,588     Vacuum Apparatus . . . . . . . . . . .Nov. 25, 1881
   251,536     Vacuum Pump. . . . . . . . . . . . . . Dec. 5, 1881
   264,650     Manufacturing Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . . Dec. 5, 1881
   264,660     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . Dec. 5, 1881
   379,770     Incandescent Electric Lamp . . . . . . Dec. 5, 1881
   293,434     Incandescent Electric Lamp . . . . . . Dec. 5, 1881
   439,391     Junction Box for Electric Wires. . . . Dec. 5, 1881
   454,558     Incandescent Electric Lamp . . . . . . Dec. 5, 1881
   264,653     Incandescent Electric Lamp . . . . . .Dec. 13, 1881
   358,600     Incandescing Electric Lamp . . . . . .Dec. 13, 1881
   264,652     Incandescent Electric Lamp . . . . . .Dec. 15, 1881
   278,419     Dynamo Electric Machines . . . . . . .Dec. 15, 1881

   1882

   265,779     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Jan. 17, 1882
   264,654     Incandescent Electric Lamps. . . . . .Feb. 10, 1882
   264,661     Regulator for Dynamo Electric Machines Feb. 10, 1882
   264,664     Regulator for Dynamo Electric Machines Feb. 10, 1882
   264,668     Regulator for Dynamo Electric Machines Feb. 10, 1882
   264,669     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Feb. 10, 1882
   264,671     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Feb. 10, 1882
   275,613     Incandescing Electric Lamp . . . . . .Feb. 10, 1882
   401,646     Incandescing Electric Lamp . . . . . .Feb. 10, 1882
   264,658     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Feb. 28, 1882
   264,659     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Feb. 28, 1882
   265,780     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Feb. 28, 1882
   265,781     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Feb. 28, 1882
   278,416     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Feb. 28, 1882
   379,771     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Feb. 28, 1882
   272,034     Telephone. . . . . . . . . . . . . . March 30, 1882
   274,576     Transmitting Telephone . . . . . . . March 30, 1882
   274,577     Telephone. . . . . . . . . . . . . . March 30, 1882
   264,662     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . .May 1, 1882
   264,663     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . .May 1, 1882
   264,665     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . .May 1, 1882
   264,666     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . .May 1, 1882
   268,205     Dynamo or Magneto Electric
               Machine. . . . . . . . . . . . . . . . .May 1, 1882
   273,488     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . .May 1, 1882
   273,492     Secondary Battery. . . . . . . . . . . May 19, 1882
   460,122     Process of and Apparatus for
               Generating Electricity . . . . . . . . May 19, 1882
   466,460     Electrolytic Decomposition . . . . . .May 19,. 1882
   264,672     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . May 22, 1882
   264,667     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . May 22, 1882
   265,786     Apparatus for Electrical Transmission
               of Power . . . . . . . . . . . . . . . May 22, 1882
   273,828 System of Underground Conductors of
               Electric Distribution. . . . . . . . . May 22, 1882
   379,772     System of Electrical Distribution. . . May 22, 1882
   274,292     Secondary Battery. . . . . . . . . . . June 3, 1882
   281,353     Dynamo or Magneto Electric Machine . . June 3, 1882
   287,523     Dynamo or Magneto Electric Machine . . June 3, 1882
   365,509     Filament for Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . . .June 3 1882
   446,668     Electric Are Light . . . . . . . . . . .June 3 1882
   543,985     Incandescent Conductor for Electric
               Lamps. . . . . . . . . . . . . . . . . June 3, 1882
   264,651     Incandescent Electric Lamps. . . . . . June 9, 1882
   264,655     Incandescing Electric Lamps. . . . . . June 9, 1882
   264,670     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . . June 9, 1882
   273,489     Turn-Table for Electric Railway. . . . June 9, 1882
   273,490     Electro Magnetic Railway System. . . . June 9, 1882
   401,486     System of Electric Lighting. . . . . .June 12, 1882
   476,527     System of Electric Lighting. . . . . .June 12, 1882
   439,390     Electric Lighting System . . . . . . .June 19, 1882
   446,666     System of Electric Lighting. . . . . .June 19, 1882
   464,822     System of Distributing Electricity . .June 19, 1882
   304,082     Electrical Meter . . . . . . . . . . .June 24, 1882
   274,296     Manufacture of Incandescents . . . . . July 5, 1882
   264,656     Incandescent Electric Lamp . . . . . . July 7, 1882
   265,782     Regulator for Dynamo Electric Machines July 7, 1882
   265,783     Regulator for Dynamo Electric Machines July 7, 1882
   265,784     Regulator for Dynamo Electric Machines July 7, 1882
   265,785     Dynamo Electric Machine. . . . . . . . July 7, 1882
   273,494     Electrical Railroad. . . . . . . . . . July 7, 1882
   278,418     Translating Electric Currents from High
               to Low Tension . . . . . . . . . . . . July 7, 1882
   293,435     Electrical Meter . . . . . . . . . . . July 7, 1882
   334,853     Mold for Carbonizing . . . . . . . . . July 7, 1882
   339,278     Electric Railway . . . . . . . . . . . July 7, 1882
   273,714     Magnetic Electric Signalling
               Apparatus. . . . . . . . . . . . . . . Aug. 5, 1882
   282,287     Magnetic Electric Signalling
               Apparatus. . . . . . . . . . . . . . . Aug. 5, 1882
   448,778     Electric Railway . . . . . . . . . . . Aug. 5, 1882
   439,392     Electric Lighting System . . . . . . .Aug. 12, 1882
   271,613     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Aug. 25, 1882
   287,518     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Aug. 25, 1882
   406,825     Electric Meter . . . . . . . . . . . .Aug. 25, 1882
   439,393     Carbonizing Chamber. . . . . . . . . .Aug. 25, 1882
   273,487     Regulator for Dynamo Electric Machines Sept. 12, 1882
   297,581     Incandescent Electric Lamp . . . . . Sept. 12, 1882
   395,962     Manufacturing Electric Lamps . . . . Sept. 16, 1882
   287,525     Regulator for Systems of Electrical
               Distribution—Edison and C. L.
               Clarke . . . . . . . . . . . . . . . . Oct. 4, 1882
   365,465     Valve Gear . . . . . . . . . . . . . . Oct. 5, 1882
   317,631     Incandescent Electric Lamp . . . . . . Oct. 7, 1882
   307,029     Filament for Incandescent Lamp . . . . Oct. 9, 1882
   268,206     Incandescing Electric Lamp . . . . . .Oct. 10, 1882
   273,486     Incandescing Electric Lamp . . . . . .Oct. 12, 1882
   274,293     Electric Lamp. . . . . . . . . . . . .Oct. 14, 1882
   275,612     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Oct. 14, 1882
   430,932     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Oct. 14, 1882
   271,616     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Oct. 16, 1882
   543,986     Process for Treating Products Derived
               from Vegetable Fibres. . . . . . . . .Oct. 17, 1882
   543,987     Filament for Incandescent Lamps. . . .Oct. 17, 1882
   271,614     Shafting . . . . . . . . . . . . . . .Oct. 19, 1882
   271,615     Governor for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Oct. 19, 1882
   273,491     Regulator for Driving Engines of
               Electrical Generators. . . . . . . . .Oct. 19, 1882
   273,493     Valve Gear for Electrical Generator
               Engines. . . . . . . . . . . . . . . .Oct. 19, 1882
   411,016     Manufacturing Carbon Filaments . . . .Oct. 19, 1882
   492,150     Coating Conductors for Incandescent
               Lamps. . . . . . . . . . . . . . . . .Oct. 19, 1882
   273,485     Incandescent Electric Lamps. . . . . .Oct. 26, 1882
   317,632     Incandescent Electric Lamps. . . . . .Oct. 26, 1882
   317,633     Incandescent Electric Lamps. . . . . .Oct. 26, 1882
   287,520     Incandescing Conductor for Electric
               Lamps. . . . . . . . . . . . . . . . . Nov. 3, 1882
   353,783     Incandescent Electric Lamp . . . . . . Nov. 3, 1882
   430,933     Filament for Incandescent Lamps. . . . Nov. 3, 1882
   274,294     Incandescent Electric Lamp . . . . . .Nov. 13, 1882
   281,350     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Nov. 13, 1882
   274,295     Incandescent Electric Lamp . . . . . .Nov. 14, 1882
   276,233     Electrical Generator and Motor . . . .Nov. 14, 1882
   274,290     System of Electrical Distribution. . .Nov. 20, 1882
   274,291     Mold for Carbonizer. . . . . . . . . .Nov. 28, 1882
   278,413     Regulator for Dynamo Electric MachinesNov. 28, 1882
   278,414     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Nov. 28, 1882
   287,519     Manufacturing Incandescing Electric
               Lamps. . . . . . . . . . . . . . . . .Nov. 28, 1882
   287,524     Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Nov. 28, 1882
   438,298     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Nov. 28, 1882
   276,232     Operating and Regulating Electrical
               Generators . . . . . . . . . . . . . .Dec. 20, 1882

   1883

   278,415     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Jan. 13, 1883
   278,417     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Jan. 13, 1883
   281,349 Regulator for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Jan. 13, 1883
   283,985     System of Electrical Distribution. . . Jan. 13 1883
   283,986     System o' Electrical Distribution. . . Jan. 13 1883
   459,835     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .Jan. 13, 1883
   13,940      Design Patent—Incandescing Electric
               Lamp . . . . . . . . . . . . . . . . . Feb. 13 1883
   280,727     System of Electrical Distribution. . . Feb. 13 1883
   395,123     Circuit Controller for Dynamo Machine.Feb. 13, 1883
   287,521     Dynamo or Magneto Electric Machine . .Feb. 17, 1883
   287,522     Molds for Carbonizing. . . . . . . . .Feb. 17, 1883
   438,299     Manufacture of Carbon Filaments. . . .Feb. 17, 1883
   446,669     Manufacture of Filaments for Incandescent
               Electric Lamps . . . . . . . . . . . .Feb. 17, 1883
   476,528     Incandescent Electric Lamp . . . . . .Feb. 17, 1883
   281,351     Electrical Generator . . . . . . . . .March 5, 1883
   283,984     System of Electrical Distribution. . .March 5, 1883
   287,517     System of Electrical Distribution. . .March 14,1883
   283,983     System of Electrical Distribution. . .April 5, 1883
   354,310     Manufacture of Carbon Conductors . . .April 6, 1883
   370,123     Electric Meter . . . . . . . . . . . .April 6, 1883
   411,017     Carbonizing Flask. . . . . . . . . . .April 6, 1883
   370,124     Manufacture of Filament for Incandescing
               Electric Lamp. . . . . . . . . . . . April 12, 1883
   287,516     System of Electrical Distribution. . . .May 8, 1883
   341,839     Incandescent Electric Lamp . . . . . . .May 8, 1883
   398,774     Incandescent Electric Lamp . . . . . . .May 8, 1883
   370,125     Electrical Transmission of Power . . . June 1, 1883
   370,126     Electrical Transmission of Power . . . June 1, 1883
   370,127     Electrical Transmission of Power . . . June 1, 1883
   370,128     Electrical Transmission of Power . . . June 1, 1883
   370,129     Electrical Transmission of Power . . . June 1, 1883
   370,130     Electrical Transmission of Power . . . June 1, 1883
   370,131     Electrical Transmission of Power . . . June 1, 1883
   438,300     Gauge for Testing Fibres for
               Incandescent Lamp Carbons. . . . . . . June 1, 1883
   287,511     Electric Regulator . . . . . . . . . .June 25, 1883
   287,512     Dynamo Electric Machine. . . . . . . .June 25, 1883
   287,513     Dynamo Electric Machine. . . . . . . .June 25, 1883
   287,514     Dynamo Electric Machine. . . . . . . .June 25, 1883
   287,515     System of Electrical Distribution. . .June 25, 1883
   297,582     Dynamo Electric Machine. . . . . . . .June 25, 1883
   328,572     Commutator for Dynamo Electric Machines June 25, 1883
   430,934     Electric Lighting System . . . . . . .June 25, 1883
   438,301     System of Electric Lighting. . . . . .June 25, 1883
   297,583     Dynamo Electric Machines . . . . . . .July 27, 1883
   304,083     Dynamo Electric Machines . . . . . . .July 27; 1883
   304,084     Device for Protecting Electric Light
               Systems from Lightning . . . . . . . .July 27, 1883
   438,302     Commutator for Dynamo Electric
               Machine. . . . . . . . . . . . . . . .July 27, 1883
   476,529     System of Electrical Distribution. . .July 27, 1883
   297,584     Dynamo Electric Machine. . . . . . . . Aug. 8, 1883
   307,030     Electrical Meter . . . . . . . . . . . Aug. 8, 1883
   297,585     Incandescing Conductor for Electric
               Lamps. . . . . . . . . . . . . . . . Sept. 14, 1883
   297,586     Electrical Conductor . . . . . . . . Sept. 14, 1883
   435,688     Process and Apparatus for Generating
               Electricity. . . . . . . . . . . . . Sept. 14, 1883
   470,922     Manufacture of Filaments for
               Incandescent Lamps . . . . . . . . . Sept. 14, 1883
   490,953     Generating Electricity . . . . . . . . Oct. 9, 1883
   293,432     Electrical Generator or Motor. . . . .Oct. 17, 1883
   307,031     Electrical Indicator . . . . . . . . . Nov. 2, 1883
   337,254     Telephone—Edison and Bergmann . . . .Nov. 10, 1883
   297,587     Dynamo Electric Machine. . . . . . . .Nov. 16, 1883
   298,954     Dynamo Electric Machine. . . . . . . .Nov. 15, 1883
   298,955     Dynamo Electric Machine. . . . . . . .Nov. 15, 1883
   304,085     System of Electrical Distribution. . .Nov. 15, 1883
   509,517     System of Electrical Distribution. . .Nov. 15, 1883
   425,761     Incandescent Lamp. . . . . . . . . . .Nov. 20, 1883
   304,086     Incandescent Electric Lamp . . . . . .Dec. 15, 1883

   1884

   298,956     Operating Dynamo Electric Machine. . . Jan. 5, 1884
   304,087     Electrical Conductor . . . . . . . . .Jan. 12, 1884
   395,963     Incandescent Lamp Filament . . . . . .Jan. 22, 1884
   526,147     Plating One Material with Another. . .Jan. 22, 1884
   339,279     System of Electrical Distribution. . . Feb. 8, 1884
   314,115     Chemical Stock Quotation Telegraph—
               Edison and Kenny . . . . . . . . . . . Feb. 9, 1884
   436,968     Method and Apparatus for Drawing
               Wire . . . . . . . . . . . . . . . . . June 2, 1884
   436,969     Apparatus for Drawing Wire . . . . . . June 2, 1884
   438,303     Arc Lamp . . . . . . . . . . . . . . . June 2, 1884
   343,017     System of Electrical Distribution. . .June 27, 1884
   391,595     System of Electric Lighting. . . . . .July 16, 1884
   328,573     System of Electric Lighting. . . . . Sept. 12, 1884
   328,574     System of Electric Lighting. . . . . Sept. 12, 1884
   328,575     System of Electric Lighting. . . . . Sept. 12, 1884
   391,596     Incandescent Electric Lamp . . . . . Sept. 24, 1884
   438,304     Electric Signalling Apparatus. . . . Sept. 24, 1884
   422,577     Apparatus for Speaking Telephones—
               Edison and Gilliland . . . . . . . . .Oct. 21, 1884
   329,030     Telephone. . . . . . . . . . . . . . . Dec. 3, 1884
   422,578     Telephone Repeater . . . . . . . . . . Dec. 9, 1884
   422,579     Telephone Repeater . . . . . . . . . . Dec. 9, 1884
   340,707     Telephonic Repeater. . . . . . . . . . Dec. 9, 1884
   340,708     Electrical Signalling Apparatus. . . .Dec. 19, 1884
   347,097     Electrical Signalling Apparatus. . . .Dec. 19, 1884
   478,743     Telephone Repeater . . . . . . . . . .Dec. 31, 1884

   1885

   340,709     Telephone Circuit—Edison and
               Gilliland. . . . . . . . . . . . . . . Jan. 2, 1885
   378,044     Telephone Transmitter. . . . . . . . . Jan. 9, 1885
   348,114     Electrode for Telephone Transmitters .Jan. 12, 1885
   438,305     Fuse Block . . . . . . . . . . . . . .Jan. 14, 1885
   350,234     System of Railway Signalling—Edison
               and Gilliland. . . . . . . . . . . . .March 27,1885
   486,634     System of Railway Signalling—Edison
               and Gilliland. . . . . . . . . . . . .March 27,1885
   333,289     Telegraphy . . . . . . . . . . . . . April 27, 1885
   333,290     Duplex Telegraphy. . . . . . . . . . April 30, 1885
   333,291     Way Station Quadruplex Telegraph . . . .May 6, 1885
   465,971     Means for Transmitting Signals Electrically May 14, 1885
   422 072     Telegraphy . . . . . . . . . . . . . . Oct. 7, 1885
   437 422     Telegraphy . . . . . . . . . . . . . . Oct. 7, 1885
   422,073     Telegraphy . . . . . . . . . . . . . Nov. I 2, 1885
   422,074     Telegraphy . . . . . . . . . . . . . .Nov. 24, 1885
   435,689     Telegraphy . . . . . . . . . . . . . .Nov. 30, 1885
   438,306     Telephone - Edison and Gilliland . . .Dec. 22, 1885
   350,235     Railway Telegraphy—Edison and
               Gilliland. . . . . . . . . . . . . . .Dec. 28, 1885

   1886

   406,567     Telephone. . . . . . . . . . . . . . .Jan. 28, 1886
   474,232     Speaking Telegraph . . . . . . . . . .Feb. 17, 1886
   370 132     Telegraphy . . . . . . . . . . . . . . May 11, 1886
   411,018     Manufacture of Incandescent Lamps. . .July 15, 1886
   438,307     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . July I 5, 1886
   448,779     Telegraph. . . . . . . . . . . . . . .July IS, 1886
   411,019     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . .July 20, 1886
   406,130     Manufacture of Incandescent Electric
               Lamps. . . . . . . . . . . . . . . . . Aug. 6, 1886
   351,856     Incandescent Electric Lamp . . . . . Sept. 30, 1886
   454,262     Incandescent Lamp Filaments. . . . . .Oct. 26, 1886
   466,400     Cut-Out for Incandescent Lamps—Edison
               and J. F. Ott. . . . . . . . . . . . .Oct. 26, 1886
   484,184     Manufacture of Carbon Filaments. . . .Oct. 26, 1886
   490,954     Manufacture of Carbon Filaments for
               Electric Lamps . . . . . . . . . . . . Nov. 2, 1886
   438,308     System of Electrical Distribution. . . Nov. 9, 1886
   524,378     System of Electrical Distribution. . . Nov. 9, 1886
   365,978     System of Electrical Distribution. . .Nov. 22, 1886
   369 439     System of Electrical Distribution. . .Nov. 22, 1886
   384 830     Railway Signalling—Edison and Gilliland Nov. 24, 1886
   379,944     Commutator for Dynamo Electric MachinesNov. 26, 1886
   411,020     Manufacture of Carbon Filaments. . . .Nov. 26, 1886
   485,616     Manufacture of Carbon Filaments. . . . .Dec 6, 1886
   485,615     Manufacture of Carbon Filaments. . . . .Dec 6, 1886
   525,007     Manufacture of Carbon Filaments. . . . Dec. 6, 1886
   369,441     System of Electrical Distribution. . .Dec. 10, 1886
   369,442     System of Electrical Distribution. . .Dec. 16, 1886
   369,443     System of Electrical Distribution. . .Dec. 16, 1886
   484,185     Manufacture of Carbon Filaments. . . .Dec. 20, 1886
   534,207     Manufacture of Carbon Filaments. . . .Dec. 20, 1886
   373,584     Dynamo Electric Machine. . . . . . . .Dec. 21, 1886

   1887

   468,949     Converter System for Electric
               Railways . . . . . . . . . . . . . . . Feb. 7, 1887
   380,100     Pyromagnetic Motor . . . . . . . . . . May 24, 1887
   476,983     Pyromagnetic Generator . . . . . . . . .May 24 1887
   476,530     Incandescent Electric Lamp . . . . . . June 1, 1887
   377,518     Magnetic Separator . . . . . . . . . .June 30, 1887
   470,923     Railway Signalling . . . . . . . . . . Aug. 9, 1887
   545,405     System of Electrical Distribution. . .Aug. 26, 1887
   380,101     System of Electrical Distribution. . .Sept. 13 1887
   380,102     System of Electrical Distribution. . .Sept. 14 1887
   470,924     Electric Conductor . . . . . . . . . Sept. 26, 1887
   563,462     Method of and Apparatus for Drawing
               Wire . . . . . . . . . . . . . . . . .Oct. 17, 1887
   385,173     System of Electrical Distribution. . . Nov. 5, 1887
   506,215     Making Plate Glass . . . . . . . . . . Nov. 9, 1887
   382,414     Burnishing Attachments for PhonographsNov. 22, 1887
   386,974     Phonograph . . . . . . . . . . . . . .Nov. 22, 1887
   430,570     Phonogram Blank. . . . . . . . . . . .Nov. 22, 1887
   382,416     Feed and Return Mechanism for PhonographsNov. 29, 1887
   382,415     System of Electrical Distribution. . . Dec. 4, 1887
   382,462     Phonogram Blanks . . . . . . . . . . . Dec. 5, 1887

   1888

   484,582     Duplicating Phonograms . . . . . . . .Jan. 17, 1888
   434,586     Electric Generator . . . . . . . . . .Jan. 21, 1888
   434,587     Thermo Electric Battery. . . . . . . .Jan. 21, 1888
   382,417     Making Phonogram Blanks. . . . . . . .Jan. 30, 1888
   389,369     Incandescing Electric Lamp . . . . . . Feb. 2, 1888
   382,418     Phonogram Blank. . . . . . . . . . . .Feb. 20, 1888
   390,462     Making Carbon Filaments. . . . . . . .Feb. 20, 1888
   394,105     Phonograph Recorder. . . . . . . . . .Feb. 20, 1888
   394,106     Phonograph Reproducer. . . . . . . . .Feb. 20, 1888
   382,419     Duplicating Phonograms . . . . . . . .March 3, 1888
   425,762     Cut-Out for Incandescent Lamps . . . .March 3, 1888
   396,356     Magnetic Separator . . . . . . . . . .March 19,1888
   393,462     Making Phonogram Blanks. . . . . . . April 28, 1888
   393,463     Machine for Making Phonogram Blanks. April 28, 1888
   393,464     Machine for Making Phonogram Blanks. April 28, 1888
   534,208     Induction Converter. . . . . . . . . . .May 7, 1888
   476,991     Method of and Apparatus for Separating
               Ores . . . . . . . . . . . . . . . . . .May 9, 1888
   400,646     Phonograph Recorder and Reproducer . . May 22, 1888
   488,190     Phonograph Reproducer. . . . . . . . . May 22, 1888
   488,189     Phonograph . . . . . . . . . . . . . . May 26, 1888
   470,925     Manufacture of Filaments for Incandescent
               Electric Lamps . . . . . . . . . . . .June 21, 1888
   393,465     Preparing Phonograph Recording Surfaces June 30, 1888
   400,647     Phonograph . . . . . . . . . . . . . .June 30, 1888
   448,780     Device for Turning Off Phonogram Blanks June 30, 1888
   393,466     Phonograph Recorder. . . . . . . . . .July 14, 1888
   393,966     Recording and Reproducing Sounds . . .July 14, 1888
   393,967     Recording and Reproducing Sounds . . .July 14, 1888
   430,274     Phonogram Blank. . . . . . . . . . . .July 14, 1888
   437,423     Phonograph . . . . . . . . . . . . . .July 14, 1888
   450,740     Phonograph Recorder. . . . . . . . . .July 14, 1888
   485,617     Incandescent Lamp Filament . . . . . .July 14, 1888
   448,781     Turning-Off Device for Phonographs . .July 16, 1888
   400,648     Phonogram Blank. . . . . . . . . . . .July 27, 1888
   499,879     Phonograph . . . . . . . . . . . . . .July 27, 1888
   397,705     Winding Field Magnets. . . . . . . . .Aug. 31, 1888
   435,690     Making Armatures for Dynamo Electric
               Machines . . . . . . . . . . . . . . .Aug. 31, 1888
   430,275     Magnetic Separator . . . . . . . . . Sept. 12, 1888
   474,591     Extracting Gold from Sulphide Ores . Sept. 12, 1888
   397,280     Phonograph Recorder and Reproducer . Sept. 19, 1888
   397,706     Phonograph . . . . . . . . . . . . . Sept. 29, 1888
   400,649     Making Phonogram Blanks. . . . . . . Sept. 29, 1888
   400,650     Making Phonogram Blanks. . . . . . . .Oct. 15, 1888
   406,568     Phonograph . . . . . . . . . . . . . .Oct. 15, 1888
   437,424     Phonograph . . . . . . . . . . . . . .Oct. 15, 1888
   393,968     Phonograph Recorder. . . . . . . . . .Oct. 31, 1888

   1889

   406,569     Phonogram Blank. . . . . . . . . . . .Jan. 10, 1889
   488,191     Phonogram Blank. . . . . . . . . . . .Jan. 10, 1889
   430,276     Phonograph . . . . . . . . . . . . . .Jan. 12, 1889
   406,570     Phonograph . . . . . . . . . . . . . . Feb. 1, 1889
   406,571     Treating Phonogram Blanks. . . . . . . Feb. 1, 1889
   406,572     Automatic Determining Device for
               Phonographs. . . . . . . . . . . . . . Feb. 1, 1889
   406,573     Automatic Determining Device for
               Phonographs. . . . . . . . . . . . . . Feb. 1, 1889
   406,574     Automatic Determining Device for
               Phonographs. . . . . . . . . . . . . . Feb. 1, 1889
   406,575     Automatic Determining Device for
               Phonographs. . . . . . . . . . . . . . Feb. 1, 1889
   406,576     Phonogram Blank. . . . . . . . . . . . Feb. 1, 1889
   430,277     Automatic Determining Device for
               Phonographs. . . . . . . . . . . . . . Feb. 1, 1889
   437,425     Phonograph Recorder. . . . . . . . . . Feb. 1, 1889
   414,759     Phonogram Blanks . . . . . . . . . . March 22, 1889
   414,760     Phonograph . . . . . . . . . . . . . March 22, 1889
   462,540     Incandescent Electric Lamps. . . . . March 22, 1889
   430,278     Phonograph . . . . . . . . . . . . . .April 8, 1889
   438,309     Insulating Electrical Conductors . . April 25, 1889
   423,039     Phonograph Doll or Other Toys. . . . .June 15, 1889
   426,527     Automatic Determining Device for
               Phonographs. . . . . . . . . . . . . .June 15, 1889
   430,279     Voltaic Battery. . . . . . . . . . . .June 15, 1889
   506,216     Apparatus for Making Glass . . . . . .June 29, 1889
   414,761     Phonogram Blanks . . . . . . . . . . .July 16, 1889
   430,280     Magnetic Separator . . . . . . . . . .July 20, 1889
   437,426     Phonograph . . . . . . . . . . . . . .July 20, 1889
   465,972     Phonograph . . . . . . . . . . . . . .Nov. 14, 1889
   443,507     Phonograph . . . . . . . . . . . . . . Dec. 11 1889
   513,095     Phonograph . . . . . . . . . . . . . . Dec. 11 1889

   1890

   434,588     Magnetic Ore Separator—Edison and
               W. K. L. Dickson . . . . . . . . . . .Jan. 16, 1890
   437,427     Making Phonogram Blanks. . . . . . . . Feb. 8, 1890
   465,250     Extracting Copper Pyrites. . . . . . . Feb. 8, 1890
   434,589     Propelling Mechanism for Electric Vehicles Feb. 14, 1890
   438,310     Lamp Base. . . . . . . . . . . . . . April 25, 1890
   437,428     Propelling Device for Electric Cars. April 29, 1890
   437,429     Phonogram Blank. . . . . . . . . . . April 29, 1890
   454,941     Phonograph Recorder and Reproducer . . .May 6, 1890
   436,127     Electric Motor . . . . . . . . . . . . May 17, 1890
   484,583     Phonograph Cutting Tool. . . . . . . . May 24, 1890
   484,584     Phonograph Reproducer. . . . . . . . . May 24, 1890
   436,970     Apparatus for Transmitting Power . . . June 2, 1890
   453,741     Phonograph . . . . . . . . . . . . . . July 5, 1890
   454,942     Phonograph . . . . . . . . . . . . . . July 5, 1890
   456,301     Phonograph Doll. . . . . . . . . . . . July 5, 1890
   484,585     Phonograph . . . . . . . . . . . . . . July 5, 1890
   456,302     Phonograph . . . . . . . . . . . . . . Aug. 4, 1890
   476,984     Expansible Pulley. . . . . . . . . . . Aug. 9, 1890
   493,858     Transmission of Power. . . . . . . . . Aug. 9, 1890
   457,343     Magnetic Belting . . . . . . . . . . .Sept. 6, 1890
   444,530     Leading-in Wires for Incandescent Electric
               Lamps (reissued October 10, 1905,
               No. 12,393). . . . . . . . . . . . . Sept. 12, 1890
   534 209     Incandescent Electric Lamp . . . . . Sept. 13, 1890
   476 985     Trolley for Electric Railways. . . . .Oct. 27, 1890
   500,280     Phonograph . . . . . . . . . . . . . .Oct. 27, 1890
   541,923     Phonograph . . . . . . . . . . . . . .Oct. 27, 1890
   457,344     Smoothing Tool for Phonogram
               Blanks . . . . . . . . . . . . . . . .Nov. 17, 1890
   460,123     Phonogram Blank Carrier. . . . . . . .Nov. 17, 1890
   500,281     Phonograph . . . . . . . . . . . . . .Nov. 17, 1890
   541,924     Phonograph . . . . . . . . . . . . . .Nov. 17, 1890
   500,282     Phonograph . . . . . . . . . . . . . . Dec. 1, 1890
   575,151     Phonograph . . . . . . . . . . . . . . Dec. 1, 1890
   605,667     Phonograph . . . . . . . . . . . . . . Dec. 1, 1890
   610,706     Phonograph . . . . . . . . . . . . . . Dec. 1, 1890
   622,843     Phonograph . . . . . . . . . . . . . . Dec. 1, 1890
   609,268     Phonograph . . . . . . . . . . . . . . Dec. 6, 1890
   493,425     Electric Locomotive. . . . . . . . . .Dec. 20, 1890

   1891

   476,992     Incandescent Electric Lamp . . . . . .Jan. 20, 1891
   470,926     Dynamo Electric Machine or Motor . . . Feb. 4, 1891
   496,191     Phonograph . . . . . . . . . . . . . . Feb. 4, 1891
   476,986     Means for Propelling Electric Cars . .Feb. 24, 1891
   476,987     Electric Locomotive. . . . . . . . . .Feb. 24, 1891
   465,973     Armatures for Dynamos or Motors. . . .March 4, 1891
   470,927     Driving Mechanism for Cars . . . . . .March 4, 1891
   465,970     Armature Connection for Motors or
               Generators . . . . . . . . . . . . . March 20, 1891
   468,950     Commutator Brush for Electric Motors
               and Dynamos. . . . . . . . . . . . . March 20, 1891
   475,491     Electric Locomotive. . . . . . . . . . June 3, 1891
   475,492     Electric Locomotive. . . . . . . . . . June 3, 1891
   475,493     Electric Locomotive. . . . . . . . . . June 3, 1891
   475,494     Electric Railway . . . . . . . . . . . June 3, 1891
   463,251     Bricking Fine Ores . . . . . . . . . .July 31, 1891
   470,928     Alternating Current Generator. . . . .July 31, 1891
   476,988     Lightning Arrester . . . . . . . . . .July 31, 1891
   476,989     Conductor for Electric Railways. . . .July 31, 1891
   476,990     Electric Meter . . . . . . . . . . . .July 31, 1891
   476,993     Electric Arc . . . . . . . . . . . . .July 31, 1891
   484,183     Electrical Depositing Meter. . . . . .July 31, 1891
   485,840     Bricking Fine Iron Ores. . . . . . . .July 31, 1891
   493,426     Apparatus for Exhibiting Photographs
               of Moving Objects. . . . . . . . . . .July 31, 1891
   509,518     Electric Railway . . . . . . . . . . .July 31, 1891
   589,168     Kinetographic Camera (reissued September
               30, 1902, numbered 12,037
               and 12,038, and January 12, 1904,
               numbered 12,192) . . . . . . . . . . .July 31, 1891
   470,929     Magnetic Separator . . . . . . . . . .Aug. 28, 1891
   471,268     Ore Conveyor and Method of Arranging
               Ore Thereon. . . . . . . . . . . . . .Aug. 28, 1891
   472,288     Dust-Proof Bearings for Shafts . . . .Aug. 28, 1891
   472,752     Dust-Proof Journal Bearings. . . . . .Aug. 28, 1891
   472,753     Ore-Screening Apparatus. . . . . . . .Aug. 28, 1891
   474,592     Ore-Conveying Apparatus. . . . . . . .Aug. 28, 1891
   474,593     Dust-Proof Swivel Shaft Bearing. . . .Aug. 28, 1891
   498,385     Rollers for Ore-Crushing or Other
               Material . . . . . . . . . . . . . . .Aug. 28, 1891
   470,930     Dynamo Electric Machine. . . . . . . . .Oct 8, 1891
   476,532     Ore-Screening Apparatus. . . . . . . . .Oct 8, 1891
   491,992     Cut-Out for Incandescent Electric Lamps Nov. 10, 1891

   1892

   491,993     Stop Device. . . . . . . . . . . . . . April 5 1892
   564,423     Separating Ores. . . . . . . . . . . .June 2;, 1892
   485,842     Magnetic Ore Separation. . . . . . . . July 9, 1892
   485,841     Mechanically Separating Ores . . . . . July 9, 1892
   513,096     Method of and Apparatus for Mixing
               Materials. . . . . . . . . . . . . . .Aug. 24, 1892

   1893

   509,428     Composition Brick and Making Same. . March 15, 1893
   513,097     Phonograph . . . . . . . . . . . . . . May 22, 1893
   567,187     Crushing Rolls . . . . . . . . . . . .Dec. 13, 1893
   602 064     Conveyor . . . . . . . . . . . . . . .Dec. 13, 1893
   534 206     Filament for Incandescent Lamps. . . .Dec. 15, 1893

   1896

   865,367     Fluorescent Electric Lamp. . . . . . . May 16, 1896

   1897

   604.740     Governor for Motors. . . . . . . . . .Jan. 25, 1897
   607,588     Phonograph . . . . . . . . . . . . . .Jan. 25, 1897
   637,327     Rolls. . . . . . . . . . . . . . . . . May 14, 1897
   672,616     Breaking Rock. . . . . . . . . . . . . May 14, 1897
   675,056     Magnetic Separator . . . . . . . . . . May 14, 1897
   676,618     Magnetic Separator . . . . . . . . . . May 14, 1897
   605,475     Drying Apparatus . . . . . . . . . . .June 10, 1897
   605,668     Mixer. . . . . . . . . . . . . . . . .June 10, 1897
   667,201     Flight Conveyor. . . . . . . . . . . .June 10, 1897
   671,314     Lubricating Journal Bearings . . . . .June 10, 1897
   671,315     Conveyor . . . . . . . . . . . . . . .June 10, 1897
   675,057     Screening Pulverized Material. . . . .June 10, 1897

   1898

   713,209     Duplicating Phonograms . . . . . . . .Feb. 21, 1898
   703,774     Reproducer for Phonographs . . . . . March 21, 1898
   626,460     Filament for Incandescent Lamps and
               Manufacturing Same . . . . . . . . . .March 29,1898
   648,933     Dryer. . . . . . . . . . . . . . . . April 11, 1898
   661,238     Machine for Forming Pulverized
               Material in Briquettes . . . . . . . April 11, 1898
   674,057     Crushing Rolls . . . . . . . . . . . April 11, 1898
   703,562     Apparatus for Bricking Pulverized Material April 11, 1898
   704,010     Apparatus for Concentrating Magnetic
               Iron Ores. . . . . . . . . . . . . . April 11, 1898
   659,389     Electric Meter . . . . . . . . . . . Sept. 19, 1898

   1899

   648,934     Screening or Sizing Very Fine Materials Feb. 6, 1899
   663,015     Electric Meter . . . . . . . . . . . . Feb. 6, 1899
   688,610     Phonographic Recording Apparatus . . .Feb. 10, 1899
   643,764     Reheating Compressed Air for
               Industrial Purposes. . . . . . . . . .Feb. 24, 1899
   660,293     Electric Meter . . . . . . . . . . . .March 23,1899
   641,281     Expanding Pulley—Edison and Johnson .March 28,1899
   727,116     Grinding Rolls . . . . . . . . . . . .June 15, 1899
   652,457     Phonograph (reissued September 25,
               1900, numbered 11,857) . . . . . . . Sept. 12, 1899
   648,935     Apparatus for Duplicating Phonograph
               Records. . . . . . . . . . . . . . . .Oct. 27, 1899
   685,911     Apparatus for Reheating Compressed
               Air for Industrial Purposes. . . . . .Nov. 24, 1899
   657,922     Apparatus for Reheating Compressed
               Air for Industrial Purposes. . . . . . Dec. 9, 1899

   1900

   676,840     Magnetic Separating Apparatus. . . . . Jan. 3, 1900
   660,845     Apparatus for Sampling, Averaging,
               Mixing, and Storing Materials in Bulk Jan. 9, 1900
   662,063     Process of Sampling, Averaging, Mixing,
               and Storing Materials in Bulk. . . . . Jan. 9, 1900
   679,500     Apparatus for Screening Fine Materials Jan. 24, 1900
   671,316     Apparatus for Screening Fine Materials  Feb. 23, 1900
   671,317     Apparatus for Screening Fine Materials March 28, 1900
   759,356     Burning Portland Cement Clinker, etc April 10, 1900
   759,357     Apparatus for Burning Portland Cement
               Clinker, etc . . . . . . . . . . . . .April 10 1900
   655,480     Phonographic Reproducing Device. . . .April 30 1900
   657,527     Making Metallic Phonograph Records . April 30, 1900
   667,202     Duplicating Phonograph Records . . . April 30, 1900
   667,662     Duplicating Phonograph Records . . . April 30, 1900
   713,863     Coating Phonograph Records . . . . . . May IS, 1900
   676,841     Magnetic Separating Apparatus. . . . . June 11 1900
   759,358     Magnetic Separating Apparatus. . . . . June 11 1900
   680,520     Phonograph Records . . . . . . . . . .July 23, 1900
   672,617     Apparatus for Breaking Rock. . . . . . Aug. 1, 1900
   676,225     Phonographic Recording Apparatus . . .Aug. 10, 1900
   703,051     Electric Meter . . . . . . . . . . . Sept. 28, 1900
   684,204     Reversible Galvanic Battery. . . . . . Oct. IS 1900
   871,214     Reversible Galvanic Battery. . . . . . Oct. IS 1900
   704,303     Reversible Galvanic Battery. . . . . .Dec. 22, 1900

   1901

   700,136     Reversible Galvanic Battery. . . . . . Feb. 18 1901
   700,137     Reversible Galvanic Battery. . . . . . Feb. 23 1901
   704,304     Reversible Galvanic Battery. . . . . .Feb. 23, 1901
   704,305     Reversible Galvanic Battery. . . . . . May 10, 1901
   678,722     Reversible Galvanic Battery. . . . . .June 17, 1901
   684,205     Reversible Galvanic Battery. . . . . .June 17, 1901
   692,507     Reversible Galvanic Battery. . . . . .June 17, 1901
   701,804     Reversible Galvanic Battery. . . . . .June 17, 1901
   704,306     Reversible Galvanic Battery. . . . . .June 17, 1901
   705,829     Reproducer for Sound Records . . . . .Oct. 24, 1901
   831,606     Sound Recording Apparatus. . . . . . .Oct. 24, 1901
   827,089     Calcining Furnaces . . . . . . . . . .Dec. 24, 1901