. 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 . ly or primaryand secondary. Two to three pounds ofNo. 14 B & S magnet wire are wound on aniron wire core eight to ten inches in lengthby one inch in diameter. The contact ismade and broken in the igniter of theengine as at the wipe spring of a ratchet gasburner. Four to eight large cells of drybattery are used, or eight cells Edison-Lalande—iron-clad type. Number of cellsvaries with size of c
. 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 . ly or primaryand secondary. Two to three pounds ofNo. 14 B & S magnet wire are wound on aniron wire core eight to ten inches in lengthby one inch in diameter. The contact ismade and broken in the igniter of theengine as at the wipe spring of a ratchet gasburner. Four to eight large cells of drybattery are used, or eight cells Edison-Lalande—iron-clad type. Number of cellsvaries with size of coil needed, some classesof engines require a heavier spark thanothers to ignite the vapor. When a primary and secondary are used,the primary should be made of two or threelayers No. 14 B & S magnet wire, and asecondary of one pound No. 34 B & Smagnet wire. There can be an independentcontact breaker or the coil can be made upsimilar to a one-half inch spark Ruhmkorffsoil (see Chapter I.). The method of connecting up a coil of the 38 Coil Construction, latter description is shown in Fig. 12, whichis self-explanatory. It shows a form ofcam-shaft switch which is operated by the QAM SHAFT. Fig. 12. engine, and which opens and closes the pri-mary circuit of the induction coil, the sparks Coil Coftstruction. 39 from the secondary winding passing be-tween the points of the igniter in the enginecyHnder. As shown in Fig. 12, the igniteror ignition plug is similar in operation to acoil discharger, the two terminals being,however, insulated from each other by theuse of porcelain. To ensure a good insula-tion under the severe working conditionshas been somewhat of a task, but it seems tohave been attained in the types of ignitersknown as the Splitdorf and the Roche orNew Standard. The Splitdorf gas-engine coil is the resultof much experiment and careful design. Itis built to stand hard usage, and the insula-tion used has been adopted only after ex-haustive test. In automobile work, where
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