![The thermionic vacuum tube and its applications . shown in Fig. 100. It will be recognized that withthe key K open and Ko closed the circuit is the same as Fig. The thermionic vacuum tube and its applications . shown in Fig. 100. It will be recognized that withthe key K open and Ko closed the circuit is the same as Fig.](https://c8.alamy.com/comp/2CE5FF5/the-thermionic-vacuum-tube-and-its-applications-shown-in-fig-100-it-will-be-recognized-that-withthe-key-k-open-and-ko-closed-the-circuit-is-the-same-as-fig-97except-that-the-meter-is-replaced-by-the-telephone-receiver-tand-a-source-s-of-alternating-current-is-used-instead-of-the-battery-loc-cit-198-thermionic-vacuum-tube-el-the-circuit-therefore-gives-a-means-of-measuring-i-which-canbe-done-by-adjusting-ri-until-the-tone-in-the-receiver-t-vanishesto-measure-the-phite-resistance-vp-let-the-key-k-be-closed-ifcg-be-the-alternating-voltage-apphed-between-filament-and-gridthe-alte-2CE5FF5.jpg)
The thermionic vacuum tube and its applications . shown in Fig. 100. It will be recognized that withthe key K open and Ko closed the circuit is the same as Fig.
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