. 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 . ^3> ^. Fig. 69. 230 Tesla and Hertz Effects. Ruhmkorff coil / terminate at the con-densers C C. Bridged across the wiresbefore they reach the condensers is thedischarger D. The second teiminals ofthe condensers are led through the splitprimary of the disruptive coil, terminatingat the points B B oi the second secondary of the disruptive coil iseither outside or inside the pr
. 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 . ^3> ^. Fig. 69. 230 Tesla and Hertz Effects. Ruhmkorff coil / terminate at the con-densers C C. Bridged across the wiresbefore they reach the condensers is thedischarger D. The second teiminals ofthe condensers are led through the splitprimary of the disruptive coil, terminatingat the points B B oi the second secondary of the disruptive coil iseither outside or inside the primary condensers are of special design, beingsmall, but of high insulation. They eachconsist of two plates of metal a few inchessquare immersed in oil and arranged sothey can be brought nearer together orfurther apart, as necessar}^ Within lim-its, the smaller these plates are the morefrequent will be the oscillations of theirdischarge. They also fulfil another pur-pose, they help nullify the high self-induc-tion of the secondary coil by adding capac-ity to it. The discharger tips are preferably metalballs under i inch in diameter. Tesla usesvarious forms of dischargers, but for ex- Tesla and Hert:
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