A text-book of physics : with sections on the application of physics to physiology and medicine (1902)
Lehfeldt, Robert Alfred, 1868-1927 · London : E. Arnold · leaf 233
with a very high frequencyof interruption (see description, p. 243), so as to give a clean sing-ing tone when in action; one Leclanche cell should be sufficientto drive it. As a galvanometer gives no indications with alter- 222 ELECTRIC CURRENTS nating currents, it must be replaced by a telephone… … Fig. 78. sistance box (r), and dc the electrolyte (s) to be measured. Thebalance is obtained by choosing a value of b approximately equal tos and then sliding the contact-maker at a along the wire till thesound in the telephone disappears as completely as possible. Then B = EXkBgth« length ab The…
Physics
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