. An elementary book on electricity and magnetism and their applications. ecreases the local battery current flowing between the plate andfilament. An external positive charge (from the aerial) applied tothe grid will to some extent neutralize the negative charge and thusincrease the local battery current, but an external negative charge will cause greater absorption ofFixed Con. electrons and reduce the bat- tery current still more. Hence,if an alternating be im-pressed between the grid andfilament, the positive alternationincreases the local battery cur-rent and the negative alternati
. An elementary book on electricity and magnetism and their applications. ecreases the local battery current flowing between the plate andfilament. An external positive charge (from the aerial) applied tothe grid will to some extent neutralize the negative charge and thusincrease the local battery current, but an external negative charge will cause greater absorption ofFixed Con. electrons and reduce the bat- tery current still more. Hence,if an alternating be im-pressed between the grid andfilament, the positive alternationincreases the local battery cur-rent and the negative alternationdecreases it. The receiving transformerusually consists of two coilsof fine wire so arranged thatthe number of turns usedcan be varied, and also therelative positions of the two coils. One form of tuning coilsis shown in figure 414. There is also in nearly every receivingcircuit a small variable receiving condenser (Fig. 415). Thisusually consists of semicir-cular metal plates separatedby air as the dielectric andhaving the alternate platesfixed. The other plates ro-. Fig. 414. — A receiving transformer.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
