The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 499
81, c = 8 amperes and a = lOl ohms, then by (1) r-i^-lOl = 1*71-lOl = *7 ohm, and by (2) T37 — = —— — 1 ohm as before. The above formulae apply not only to batteries, but to anycircuit or part of a circuit. If direct measurement instruments are not available, themost common method is to connect up… … Fig. 446. -Connections of Wheatstone Bridge for Test of BatteryResistance the shunt, a resistance of, say, 1 ohm is unplugged in a resis-tance-box included in the circuit, and the reduced deflectionobserved. Fig. 446 shows the connections using a Post-Officebridge. The deflections in the two cases…
Telephone
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