Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 275
ained ;C = length of wire between point 4 and d when balance is ob-tained ;D = value of unknown resistance. Then by the above formula, Resistance of D = Res °* A x length C (91) length B v ! More briefly D = —*-°- Several different spools are furnished with the bridge, suchas 1, 10 and 100 ohms,… … 256 PRACTICAL ELECTRICITY. The contacts should be clean and all wires fastened tightly,the slider should also be cleaned. Care must be exercisedin moving the slider over the bridge wire so that it is notscraped, since the accuracy of measurement depends upon theuniform cross-section of the bridge…
Electricity · Magnetism
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