Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 397
atus 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… … 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…
Electrical engineering
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