Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery (1901)
Schneider, Norman H. (Norman Hugh) · New York : Spon & Chamberlain ; London : E. & F.N. Spon · leaf 234
n to the battery charger. It is thesafest way to test the polarity of the ter-minals -of hoth battery and mains each timecharging is commenced. For polarity testssee Chapter I. It is immaterial on whichside of the battery the rheostat or similardevice is placed. Fig. 65 shows the employment of… … Fig. 64.
Induction coils · Radiography · X-rays
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