. 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 . ount of wire,however, was one of the things which made up the weightof the moving parts, and in order that these moving partsmight be made as light as possible, the moving coil wascut down to 20 ohms resistance and a proper inductioncoil supplied to fit it. The coils were still wound fi
. 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 . ount of wire,however, was one of the things which made up the weightof the moving parts, and in order that these moving partsmight be made as light as possible, the moving coil wascut down to 20 ohms resistance and a proper inductioncoil supplied to fit it. The coils were still wound fiat on amica sheet, but in or-der to reduce still fur-ther the weight of thecomplete instrument,one of the electromag-nets was done awaywith and the little coilwas found to functionperfectly with onlyone side of the coil inthe magnetic 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 coil was reduced,it was found that the receiver had loud- Another type of loxid-speaker, larger 4 • 1 , . than the one shown on the facing page Speakmg cnaractens- and intended for a medium-sized 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 a timeto the development of a transmitter for use in conjunc-ion with the electrodynamic receiver. A transmitter was ...., POLE PIECES \^^^ i^ 11 wA 1^ -Bi Diaphragm MOVABLECOIL The mechanism of the electrodynam^ic type of loud-speaker, • consisting: of the pole pieces of the electro-magnet, the movable coil, and the diaphragm. accordingly built that would pass a little over one am
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
