. 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 . be made on a hard rubber spool, thehole through centre of this spool must beat least one inch larger in diameter than thediameter of the primary cover. This spoolshould not exceed four inches in length, andis to be slipped over the primary coil andheld suspended by blocks of wood in sucha manner that it does not touch the primarycoil or cover. The whole outfit is nowimmersed in an earthenware
. 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 . be made on a hard rubber spool, thehole through centre of this spool must beat least one inch larger in diameter than thediameter of the primary cover. This spoolshould not exceed four inches in length, andis to be slipped over the primary coil andheld suspended by blocks of wood in sucha manner that it does not touch the primarycoil or cover. The whole outfit is nowimmersed in an earthenware or glass vesselfilled with linseed or heavy paraffin contact breaker and condenser will bemounted independently; the condenser forthe two-inch spark coil will be suitable (seeTable on page —). Tesla Coil. The coil just described, without contactbreaker or iron core, can be connected upand used in place of a Tesla coil, which Coil Construction. 35 it resembles. The coils used by NikolaTesla are so many and varied that it becomesa difficult task to describe a mode of con-struction which will meet the wants of thosewho ask for Tesla coils. The AmericanElectrician gives a description of one. Fig. II. wherein a glass battery jar, 6 inches X8 inches, is wound with 6o to 8o turns ofNo. i8 B & S magnet wire. Into this isslipped a primary, consisting of 8 to lOturns of No. 6 B & S wire, and the wholecombination immersed in a vessel containinglinseed or mineral oil. 36 Coil Construction, Disruptive Tesla Coil. For Fig. 11 the specification is as follows:Secondary, 300 turns of No. 30 B & S silk-covered magnet wire, wound on rubber tubeor rod, and the ends encased in glass orrubber tubes. This is inserted into the pri-mary, which consists of two coils, each of20 turns No. 16 B & S rubber-covered wire,wound separately on a long rubber tube notless than -J inch thick. The last tube mustbe large enough to be very loose when thesecondary coil is inserted in it, and it mustproject a
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