. 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 . n this manner the storage battery may be re-charged whenever necessary, at a minimum of expenseand without losing valuable time. Aside from the storage battery for the filament, a Bbattery must be provided. This battery must be a high-voltage one. In the early days of vacuum tubes a num
. 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 . n this manner the storage battery may be re-charged whenever necessary, at a minimum of expenseand without losing valuable time. Aside from the storage battery for the filament, a Bbattery must be provided. This battery must be a high-voltage one. In the early days of vacuum tubes a numberof flash-lamp batteries were connected together so as toobtain the necessary current, but today there are specialdry B batteries put up in compact units of 22^^ volts RADIO FOR EVERYBODY 12: each. These **B battery units come in a small size anda large size. If the receiving set is to be used at regularintervals, it is the part of better judgment to buy thelarger size. A single B battery unit is necessary fora vacuum tube detector circuit,- and two units are neces-sary if an amplifier is also used with headsets, and threeor four units if a loud-speaker is employed, as will beexplained in the next chapter devoted to amplifier dry ^B batteries come in two types, aside from GL m 60 TO TUNER. -=-6 Principle of vacuu>m tubes operation: GLi—Grid leak;CC—condenser; F—filament; G—grid; P—plate; VT—vacuumtube; A—Storage battery for operating vacuum tube fila-ment; R—rheostat for filament current; B—^high voltageB battery or plate battery, and telephones. the two sizes. There is the fixed voltage type, in whichtwo leads or terminals give the full voltage of the battery,and there is a variable voltage type, in which lugs, bindingposts, or holes and plugs permit of using a number ofdifferent voltages. The variable type is especially usefulin using certain types of vacuum tube with which the Bvoltage must be carefully adjusted. When it comes toamplifier
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