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 123
>ool is wound ■SOft. of No. 24 B. &S.Copper Wire. Diameter, .0201 inchCircular mil area (d2)= .0201 x 0201=404 C. M.Ohms per 1000 feet=25.695Feet per ohm =38.918 Ohms per pound =Pure Copper Wire, S]Gravity 8.9.Resistance at75° F. NO. 3. This spool is wound with 25 ft. of No.… … Fig. 101.—Resistance Spool Set. Exp. 37: Connect spool 2 in place of1, and note the deflection, which issmaller than before. Why ? Exp. 38: Connect spool 3 in place of 2,and note the deflection. It is greaterthan either 1 or 2. Why is this so, sinceit is of the same length and material as 1? Exp.…
Electricity · Magnetism
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