Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art (1922)
Lescarboura, Austin C. (Austin Celestin), 1891- · New York, Scientific American publishing company [etc.] · leaf 218
the coil inthe magnetic field.This type was finallydeveloped, and wasthe first of the electro-dynamic receivers tobe commercially suc-cessful, out of all thetypes which had beendeveloped by the in-ventors thus far. Thistvpe was brought outin July, 1915. Immediately the re-sistance of the mov-able… … 200 RADIO FOR EVERYBODY tics, and still retained its perfection of reproduction ofspeech. It was then realized that no loud-speaker couldbe expected to give forth loud speech unless sufficientmodulated current was supplied to it, so it became neces-sary for the inventors to turn their attention for…
Radio
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