File:Cyclopedia of applied electricity - a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905) (14732906996).jpg

Identifier: cyclopediaofappl00ameruoft (find matches)
Title: Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity
Year: 1905 (1900s)
Authors: American School (Chicago, Ill.)
Subjects: Electric engineering
Publisher: Chicago : American School of Correspondence
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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Text Appearing Before Image:
Diagram of DeForest Wireless-Telegraph System.Fig. 38. of the current is read by means of a telephone receiver 12. Theapparatus is very compact as Fig. 37 shows, it is rapid in operationand accurate in its translations. American De Forest. Another system using the telephonereceiver as a means of indication is the American De Forest. Thiswas the first commercial system to employ an alternating-currentgenerator and an oil transformer to charge the oscillator system. ■\iy_ ^ v^^H ■^H -, ►. ..„ . ■IW^ Ho * mM1^J^9I^ ^x^^^^Stm^^^^^f / ^^^SI^^^^^K^^^^^^^^B^^^k^r^ < J^^^\^B;^^^ / DeForest System Transmitter.Fig. 39. 362
Text Appearing After Image:
Q J- fc. il z z WIRELESS TELEGRAPHY 33 The transmitter A, Fig. 38, includes an alternating-current gener-ator 1, an ordinary Morse key 2, with contacts breaking under oil,and a transformer 3. The aerial wire 4 and earthed wire 5 form asimple open-circuit oscillator through the spark-gap 0; this systemis supplied with energy by the condensers 7 and 8 which arecharged by the secondary of the transformer. The receiver in itssimplest form comprises a self-restoring detector invented by Dr.De Forest and E. H. Smythe, called an electrolytic responder—previously described under Principles—a cell and a telephonereceiver. In practice, it takes on the form shown at B; tworesponders 1, 1 are connected with the serial wire and earth; the

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