ADVICE IN REGARD TO PATENTS.

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The influence of invention on modern life can be very justly estimated by a perusal of “The Progress of Invention in the Nineteenth Century.” It is, of course, well known that inventors are necessarily assisted in the prosecution of their applications for patents in the Patent Office by patent attorneys. It gives Messrs, Munn & Co. pleasure to announce that they have prosecuted, during a period of over fifty years, some of the most important patent cases which have ever been sent to the Patent Office. During this long period they have filed and prosecuted over one hundred thousand applications for patents. Their reputation is such that inventors have found that they may submit their ideas with entire confidence that their trust will not be betrayed, and that their interests will be protected to the fullest extent. They secure patents, trade-marks, caveats and copyrights. A little book entitled “Hand-Book on Patent Practice” will be sent free to any address, and any questions relating to patents will be cheerfully answered by return mail without charge. Thousands of clients all over the United States, many of them the most successful inventors which this country has produced, have had the professional services of Messrs. Munn & Co. in the preparation and prosecution of their patent applications before the United States and foreign patent offices. The integrity of this firm, and their attention to this branch of their business, has resulted in the largest practice of any firm of patent attorneys in the United States. Inventors are invited to write freely regarding their inventions, and their sketches will be carefully and promptly examined. All communications of this kind are treated as strictly confidential. The readers of “The Progress of Invention in the Nineteenth Century” may also be interested to know that Munn & Co. have offices in both New York and Washington, and thus are able to keep in close touch with the work of the Patent Office. They have unsurpassed facilities for examining and reporting on the probable patent-ability of inventions, and they render opinions on questions of infringement and validity of patents; and they also have been most successful in the prosecution of interferences.

Further particulars may be obtained by addressing

MUNN & CO.,

Branch Office:
625 F Street,
Washington, D. C.

SCIENTIFIC AMERICAN OFFICE,
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New York City.

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Scientific American

THE MOST POPULAR SCIENTIFIC PAPER
IN THE WORLD

Established 1845.

Weekly, $3.00 a Year; $1.50 Six Months

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This unrivalled periodical is now in its FIFTY-SIXTH YEAR, and, owing to its ever increasing popularity, it enjoys the largest circulation ever attained by any scientific publication. Every number contains sixteen large pages, beautifully printed, handsomely illustrated; it presents in popular style a descriptive record of the most novel, interesting and important developments in Science, Arts and Manufactures. It abounds in fresh and interesting subjects for discussion, thought or study. It provides material for experiment at home and in the laboratory, and it enables the intelligent reader to keep informed as to the industrial and scientific development of the country. To the inventor it is invaluable, as every number contains a complete list of all patents and trade marks issued weekly from the Patent Office. It promotes industry, progress, thrift and intelligence in every community where it circulates.

The Scientific American should have a place in every dwelling, shop, office, school or library. Workmen, foremen, engineers, superintendents, directors, presidents, officials, merchants, farmers, teachers, lawyers, physicians, clergymen—people in every walk and profession in life, will derive satisfaction and benefit from a regular reading of The Scientific American.

As an instructor for the young it is of peculiar advantage. TRY IT.—Subscribe for yourself—it will bring you valuable ideas; subscribe for your sons—it will make them manly and self-reliant; subscribe for your workmen—it will please and assist their labor; subscribe for your friends—it will be likely to give them a practical lift in life. Terms, $3.00 a year; $1.50 six months. Specimen copies free. Remit by postal order or check.

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Scientific American Supplement

Established 1876

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This journal is a separate publication from The Scientific American, and is designed to extend and amplify the work carried on by the parent paper. In size and general make-up it is uniform therewith, covering sixteen pages of closely printed matter, handsomely illustrated. It has no advertising pages, and the entire space is given up to the scientific, mechanical and engineering news of the day. It differs from The Scientific American in that it contains many articles that are too long to be published in the older journal or of a more technical nature. College professors and students find this edition especially adapted to their wants. It contains reports of the meetings of the scientific societies, both in this country and abroad, and abstracts of many papers read before such societies. It has a page of short notes concerning the electrical, engineering and general scientific news of the day, together with a column of selected formulæ. Each number contains much foreign scientific news, and, when taken in connection with The Scientific American, it places before the reader a weekly review of the latest and most important discoveries and the most advanced technical and scientific work of the times all over the world.

PRICE FOR THE SUPPLEMENT, $5 A YEAR, or one copy of The Scientific American and one copy of Supplement, both mailed to one address, for one year, for $7. Address and remit by postal order or check.

MUNN & CO., Publishers,

SCIENTIFIC AMERICAN OFFICE
361 Broadway, New York

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The SCIENTIFIC AMERICAN,

ARCHITECTS’ and BUILDERS’ EDITION.

$2.50 a Year

Single copies, 25 cts.

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This is a special edition of the Scientific American, issued monthly—on the first day of the month. Each number contains about forty large quarto pages, equal to about 200 ordinary book pages, forming, practically, a large and splendid Magazine of Architecture, richly adorned with elegant plates in colors and with fine engravings, illustrating the most interesting examples of modern architectural construction and allied subjects. A special feature is the presentation in each number of a variety of the latest and best plans for private residences, city and country, including those of very moderate cost, as well as the more expensive. Drawings in perspective and in color are given, together with plans, specifications, costs, etc. No other building paper contains so many plans and specifications, regularly presented, as the Scientific American. Thousands of dwellings have already been erected on the various plans we have issued, and many others are in process of construction.

Architects, builders and house owners will find this work valuable in furnishing fresh and useful suggestions. All who contemplate building or improving homes, or erecting structures of any kind, have before them in this work an almost endless series of the latest and best examples from which to make selections, thus saving time and money.

Many other subjects, including sewerage, piping, lighting, warming, ventilating, decorating, laying out of grounds, etc., are illustrated. An extensive Compendium of manufacturers’ announcements is also given, in which the most reliable and approved building materials, goods, machines, tools and appliances are described and illustrated, with addresses of the makers, etc.

The fulness, richness, cheapness and convenience of this work have won for it the largest circulation of any architectural publication in the world.

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Fiftieth Anniversary Number
OF THE
SCIENTIFIC AMERICAN.

In commemoration of the fiftieth year of the publication of the weekly edition of the SCIENTIFIC AMERICAN, its publishers on July 25th, 1896, issued a memorial edition which forms a valuable resumé of the progress of science and invention during the past fifty years. Among the subjects treated are:

THE EFFECT OF INVENTION ON THE PEOPLE’S LIFE. THE PATENT SYSTEM. THE TRANSATLANTIC STEAMSHIP. RAILROADS AND BRIDGES. THE TELEGRAPH. PHYSICS. MEN OF PROGRESS. THE TEXTILE INDUSTRIES OF THE UNITED STATES SINCE 1846. THE SUBMARINE CABLE. FIFTY YEARS OF PHOTOGRAPHY. CHEMISTRY. THE PHONOGRAPH. THE PROGRESS MADE IN THE GENERATION OF ELECTRIC ENERGY AND ITS APPLICATION TO THE OPERATION OF MOTORS DURING THE PAST FIFTY YEARS. THE AMERICAN LOCOMOTIVE. THE BICYCLE. THE SEWING MACHINE. AGRICULTURAL MACHINERY. NAVAL AND COAST DEFENSE. FIFTY YEARS IN THE PRINTING BUSINESS. THE PRIZE ESSAY OF THE SEMI-CENTENNIAL ANNIVERSARY NUMBER—“THE PROGRESS OF INVENTION DURING THE LAST FIFTY YEARS.” STEEL. DISTINGUISHED INVENTORS. AMERICAN SHIPBUILDING. DEVELOPMENT OF THE ASTRONOMICAL TELESCOPE IN FIFTY YEARS. THE TELEPHONE. FIFTY YEARS OF THE “SCIENTIFIC AMERICAN.”

The number is fully illustrated and contains fifty pages. In it is printed “The Progress of Invention During the Last Fifty Years,” for which a prize of $250 was offered. It is interesting to note that this prize was won by Edward W. Byrn, the author of “The Progress of Invention in the Nineteenth Century.” Never before has so much valuable information of historical interest and importance been published in so condensed and popular a form. It forms a valuable addition to any library, and copies of the Anniversary Number can be supplied at 25 cents per copy.

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MUNN & CO., Publishers,

SCIENTIFIC AMERICAN OFFICE
361 Broadway, New York

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Experimental Science.

By GEORGE M. HOPKINS.

TWENTIETH EDITION, REVISED AND GREATLY ENLARGED.

914 Pages. 820 Illustrations. Handsomely Bound in Cloth.

Price by mail, postpaid, $4.00; Half Morocco, $5.00.

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The new matter comprises eighty pages of text in the form of an appendix, including among other subjects

A Complete Article on the X-Ray.
Wireless Telegraphy.Liquefaction of Air.
Acetylene Gas Apparatus.Artificial Spectrum.
And other articles which bring the work fully up to date.

This is a book full of interest and value for teachers, students and others who desire to impart or obtain a practical knowledge of Physics.

THE MOST POPULAR SCIENTIFIC BOOK OF THE DAY.

What the press says of “EXPERIMENTAL SCIENCE.”

“The electrical chapters of the book are notably good, and the practical instruction given for building simple electrical machinery may be safely carried out by those—not a few—who like to make their own apparatus.”—Electrical World.

“The author has avoided repeating the hackneyed illustrations which have been passed from one book to another so long, and, instead, offers a set of experiments which are largely of a novel character and very striking.”—Engineering and Mining Journal.

“It is a treat to read a book of this kind, that sets forth the principles of physics so fully, and without the use of mathematics.”-The Locomotive.

“All teachers of science are aware that real knowledge is acquired best by the student making experiments for himself, and anyone who points out how those experiments may be easily made is doing excellent work.”—English Mechanic and World of Science.

“The work bears the stamp of a writer who writes nothing but with certainty of action and result, and of a teacher who imparts scientific information in an attractive and fascinating manner.”—American Engineer.

Mr. Thomas A. Edison says: ““The practical character of the physical apparatus, the clearness of the descriptive matter, and its entire freedom from mathematics, give the work a value, in my mind, superior to any other work on elementary physics of which I am aware.””

Send for Illustrated Circular and Complete Table of Contents.

☛ Send for our New and Complete Catalogue of Books, sent free to any address.

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MUNN & CO., Publishers,

SCIENTIFIC AMERICAN OFFICE
361 Broadway, New York

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THE SCIENTIFIC AMERICAN

Cyclopedia of Receipts

NOTES AND QUERIES

12,500 RECEIPTS, 708 PAGES

Edited by ALBERT A. HOPKINS

This splendid work contains a careful compilation of the most useful Receipts and Replies given in the Notes and Queries of correspondents as published in the Scientific American during the past fifty years; together with many valuable and important additions.

OVER TWELVE THOUSAND selected receipts are here collected; nearly every branch of the useful arts being represented. It is by far the most comprehensive volume of the kind ever placed before the public.

The work may be regarded as the product of the studies and practical experience of the ablest chemists and workers in all parts of the world; the information given being of the highest value, arranged and condensed in concise form, convenient for ready use.

Almost every inquiry that can be thought of, relating to formulae used in the various manufacturing industries, will here be found answered.

Instructions for working many different processes in the arts are given.

Many of the principal substances and raw materials used in manufacturing operations are defined and described. No pains have been spared to render this collateral information trustworthy.

Those who are engaged in any branch of industry will probably find in this book much that is of practical value in their respective callings.

Those who are in search of independent business or employment, relating to the home manufacture of salable articles, will find in it hundreds of most excellent suggestions.

It is impossible within the limits of a prospectus to give more than an outline of a few features of so extensive a work. To those interested, a fully descriptive circular will be sent free upon application.

Price, $5.00 in Cloth; $6.00 in Sheep; $6.50 in Half Morocco; Postpaid.

MUNN & CO., Publishers,

SCIENTIFIC AMERICAN OFFICE
361 Broadway, New York

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A Complete Electrical Library.

By Prof. T. O’CONOR SLOANE, A.M., E.M. Ph.D.

An inexpensive library of the best books on Electricity. Put up in a neat folding box. For the student, the amateur, the workshop, the electrical engineer, schools and colleges. Comprising five books, as follows:

Arithmetic of Electricity, 138 pages	$1.00
Electric Toy Making, 140 pages	1.00
How to Become a Successful Electrician, 189 pages	1.00
Standard Electrical Dictionary, 682 pages	3.00
Electricity Simplified, 158 pages	1.00

Five volumes, 1,300 pages, and over 450 illustrations. A valuable and indispensable addition to every library.

Our Great Special Offer.—We will send prepaid the above five volumes handsomely bound in blue cloth, with silver lettering, and inclosed in a neat folding box, at the Special Reduced Price of $5.00 for the complete set. The regular price of the five volumes is $7.00. A special circular will be sent free to any address on application.

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MAGIC.	Stage Illusions and Scientific Diversions INCLUDING TRICK PHOTOGRAPHY.
Line

COMPILED AND EDITED BY

ALBERT A. HOPKINS,

Editor of “Scientific American Cyclopedia of Receipts. Notes and Queries,” etc.

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WITH AN INTRODUCTION BY HENRY RIDGELY EVANS.

Author of “Hours with the Ghosts; or, XIX. Century Witchcraft,” etc.

568 Pages. 420 Illustrations. Price, $2.50.

This work appeals to old and young alike, and it is one of the most attractive holiday books of the year. The illusions are illustrated by the highest class of engravings, and the exposés of the tricks are in many cases furnished by the prestidigitateurs themselves. Conjuring, large stage illusions, fire eating, sword-swallowing, ventriloquism, metal magic, ancient magic, automata, curious toys, stage effects, photographic tricks, and the projection of moving photographs are all well described and illustrated, making a handsome volume. It is tastefully printed and bound. Acknowledged by the profession to be the STANDARD WORK ON MAGIC. Send for large illustrated circular, sent free to any address.

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MUNN & CO., Publishers,

SCIENTIFIC AMERICAN OFFICE
361 Broadway, New York

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Mechanical Movements,

POWERS, DEVICES AND APPLIANCES.

By GARDNER D. HISCOX, M. E.

Author of “Gas, Gasoline, and Oil Engines.”

Large 8vo. 402 Pages. 1649 Illustrations, with Descriptive Text. Price, $3.00.

A Dictionary of Mechanical Movements, Powers, Devices and Appliances, embracing an illustrated description of the greatest variety of mechanical movements and devices in any language. A new work on illustrated mechanics, mechanical movements, devices and appliances, covering nearly the whole range of the practical and inventive field, for the use of Machinists, Mechanics, Inventors, Engineers, Draughtsmen, Students and all others interested in any way in the devising and operation of mechanical works of any kind.

THE CHAPTERS TREAT OF:
I.	Mechanical Powers.
II.	Transmission of Power.
III.	Measurement of Power.
IV.	Steam Power—Boilers and Adjuncts.
V.	Steam Appliances.
VI.	Motive Power—Gas and Gasoline Engines.
VII.	Hydraulic Power and Devices.
VIII.	Air Power Appliances.
IX.	Electric Power and Construction.
X.	Navigation and Roads.
XI.	Gearing.
XII.	Motion and Devices Controlling Motion.
XIII.	Horological.
XIV.	Mining.
XV.	Mill and Factory Appliances.
XVI.	Construction and Devices.
XVII.	Draughting Devices.
XVIII.	Miscellaneous Devices.

Send for descriptive Circular.

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GAS ENGINE CONSTRUCTION,

A PRACTICAL TREATISE DESCRIBING IN EVERY DETAIL THE ACTUAL BUILDING OF A GAS ENGINE.

By HENRY Y. H. PARSELL, Jr., Mem. A. I. Elec. El., and ARTHUR J. WEED, M. E.

Large 8vo. Handsomely Illustrated and Bound. 300 Pages. Price, $2.50.

This book treats of the subject more from the standpoint of practice than that of theory. The principles of operation of Gas Engines are clearly and simply described, and then the actual construction of a half-horse power engine is taken up, step by step, showing in detail the making of a Gas Engine. First come directions for making the patterns; this is followed by all the details of the mechanical operations of finishing up and fitting the castings, and is profusely illustrated with beautiful engravings of the actual work in progress, showing the modes of chucking, turning, boring and finishing the parts in the lathe, and also plainly showing the lining up and erection of the engine. Dimensioned working drawings give clearly the sizes and forms of the various details. The entire engine, with the exception of the fly-wheels, is designed to be made on a simple eight inch lathe, with slide rest. The book closes with a chapter on American practice in Gas Engine design, and gives simple rules so that anyone can figure out the dimensions of similar engines of other powers. Every illustration in this book is new and original, having been made expressly for this work.

SEND FOR DESCRIPTIVE CIRCULAR.

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MUNN & CO., Publishers,

SCIENTIFIC AMERICAN OFFICE
361 Broadway, New York

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