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 277
d to its magnet. The relay makescontact in the usual manner at the platinumpoints, and in its turn causes the localcircuit, sounder, bell, or pen register torecord the wave (or signal). After eachwave the filings are in such state that torestore them to their former high resistanceit is necessary… … Fig. 74. Wireless Telegraphy. 251 Figures 74 and 75 are diagrams of asimple circuit, Fig. 74 being the transmittingapparatus and Fig. 75 the receiving appa-ratus. In Fig. 74 P P and wS vS are the primaryand secondary of a Ruhmkorff coil, D twobrass balls on the discharger, B the battery,K a key, in…
Induction coils · Radiography · X-rays
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-212-104.webp)
