Electricity for public schools and colleges (1891)
Larden, W. (Walter), b. 1855 or 6 · London : Longmans · leaf 120
Fig. ii. Fig. iii. The reader can verify this rule when he has determined the sign of thecharge on the prime conductor of his machine. (ii.) We may {see fig. iii.) intensify the effect by coiling a wire round aglass tube in which lies the steel needle. The above rule will be found true,and it will…
Electricity
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