. 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 . but a few miles, a CWtransmitter may be readily assembled, and it can be almostas easily used for radio-phone work as for radio telegraph. First of all, the radio amateur must obtain the propervacuum tube. So far we have spoken of the vacuumtube detector and the vacuum tube ampUfier tub
. 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 . but a few miles, a CWtransmitter may be readily assembled, and it can be almostas easily used for radio-phone work as for radio telegraph. First of all, the radio amateur must obtain the propervacuum tube. So far we have spoken of the vacuumtube detector and the vacuum tube ampUfier tubes, butnow we come to thetransmitting standard trans-mitting tubes nowavailable on the mar-ket come in 5-watt,50-watt and 250-wattsizes. For our pres-ent purpose the 5-watt is the most pop-ular, since we aredealing with lowpower. Two 5-watttubes in parallel willput from one andone-quarter to oneand three-quarter am-peres in the amateursaerial. Using one ofthese tubes as a mod-ulator and the otheras an oscillator, forexperimental radiotelephony, distancesup to 40 miles can becovered, and at least four times that distance when thetwo tubes are connected in parallel for CW or five 5-watt tubes can be worked in parallel withincreased range. The 5-watt tubes are also used as power B. Hlllll-VSAWA ^ A simple continuous wave telegraphtransmitter, making: use of a single5-watt tube. This set transmitsstraight CW. A—aerial; I—aerial in-ductance; B—high voltage battery;VCl—variable condenser; G—ground;K—telegraph key; VC2—grid conden-ser; OT—oscillating tube; A—filamentbattery; K—filament rheostat. 244 RADIO FOR EVERYBODY amplifiers in radio receiving circuits. The energy ampli-fication obtained therefrom is particularly useful for theoperation of loud-speakers. The 50-watt transmitting tube is intended for \ / long-distance telephony and telegraphy. Two ^A 50-watt tubes connected in a self-rectifying or in a straight direct-cur-rent plate ex
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