St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 54
resistance coils.) Fig.64 shows a commercial form of a standard resistance coil.The coil is inclosed in a case and has large wires leading APPARATUS FOR ELECTRICAL MEASUREMENTS. 51 from its ends for connedlions. Fig. 65 gives an idea ofthe way in which coils are wound and used with plugs tobuild up… … is inverselj proportional to itsarea of cross-seclion ; or, inother words, inversely propor-tional to the square of itsdiameter, other things being Fig. 65. equal. 3. The resistance of a wire depends upon its material,as well as upon its length, size, etc. 4. The resistance of a wire increases as…
Electricity
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