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Wireless Telegraphy and Telephony Simply Explained / A Practical Treatise Embracing Complete and Detailed Explanations of the Theory and Practice of Modern Radio Apparatus and Its Present Day Applications, Together With a Chapter on the Possibilities of Its Future Development cover

Wireless Telegraphy and Telephony Simply Explained / A Practical Treatise Embracing Complete and Detailed Explanations of the Theory and Practice of Modern Radio Apparatus and Its Present Day Applications, Together With a Chapter on the Possibilities of Its Future Development

Chapter 40: PATTERN MAKING
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About This Book

The text explains the physical principles of wireless transmission and reception, describing electromagnetic oscillations and how waves are radiated and intercepted, then surveys practical apparatus such as aerial systems, transmitters, receivers, coils, condensers, spark gaps and detectors. It treats tuning, coupling and directional methods, discusses telephone transmitters and the wireless telephone, and outlines applications in maritime, military and aerial service. Chapters interweave theory, constructional sketches and illustrations, and conclude with reflections on accomplishments, limitations and the technology's prospective development.

PATTERN MAKING

PRACTICAL PATTERN MAKING. By F. W. BARROWS. This is a very complete and entirely practical treatise on the subject of pattern making, illustrating pattern work in wood and metal. From its pages you are taught just what you should know about pattern making. It contains a detailed description of the materials used by pattern makers, also the tools, both those for hand use, and the more interesting machine tools; having complete chapters on the band saw, The Buzz Saw, and the Lathe. Individual patterns of many different kinds are fully illustrated and described, and the mounting of metal patterns on plates for molding machines is included. Rules, Formulas and Tables are included, containing simple and original methods for finding the weight of castings, both from the pattern itself and from the drawings. This section contains some new and practical formulas, which will be found very useful in estimating weights, with the accuracy required for quotations to prospective customers. Ali of these rules are simple, and can be put to practical use by the ordinary, every-day man, and they have been proved by years of actual use. Plain rules for keeping down the cost of patterns, with a complete system for checking the cost of and marking the patterns, and a card record showing what the pattern is, material used, where located in safe, with its cost and date of production, is included. The book closes with an original and practical method for the inventory and valuation of patterns. Containing 326 pages and 150 detailed illustrations. Price $2.00