. The design and construction of a radio telephone station . nt reach 26 the plate, the remainder being repelled by theelectrons in space returning eventually to theirsource. The three electrode valve is shown inFigure 10, The new electrode is called thegrid. Its development is credited to Dr« LeeDe Forest, The grid electrode when placed in be-tween the filament and plate has its potentiallowered and therefore obstructs the flow of el-ectrons 30 that less escape to the plate, in fact,the current may be completely cut off by givingthe grid a sufficient negative e. m. f, A recent development in
. The design and construction of a radio telephone station . nt reach 26 the plate, the remainder being repelled by theelectrons in space returning eventually to theirsource. The three electrode valve is shown inFigure 10, The new electrode is called thegrid. Its development is credited to Dr« LeeDe Forest, The grid electrode when placed in be-tween the filament and plate has its potentiallowered and therefore obstructs the flow of el-ectrons 30 that less escape to the plate, in fact,the current may be completely cut off by givingthe grid a sufficient negative e. m. f, A recent development in the design of thethree electrode vacuum bulb is the dynatron. Thefundamental construction is shown in Figure 11,The tube contains a filament, F, a perforatedanode, A, and a plate, P. One of the peculiar operating character-istics of the dynatron is that within a certainregion of voltages applied to the plate circuit,the device acts as a eimple rectifier, but atother values of plate voltage it acts as a truenegative resistance, that is, an applied e. m, i?e ra^£&r 3-^L£cr/zff/?£ \/alu^ THjs s /S.
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Keywords: ., bookcentury1900, bookdecade1920, bookiddesignconstr, bookyear1921
