. 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 . antityof the filings, etc. There exists but littledifficulty in operating coherers; considerablelatitude is permissible as to adjustment, size,character, etc. There does not seem so muchdifficulty in obtaining sensitiveness as inguarding against external electrical disturb-ances. Wings or vanes of thin sheet metalare sometimes attached to the metal ends orelectrodes of the coherer for purpose
. 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 . antityof the filings, etc. There exists but littledifficulty in operating coherers; considerablelatitude is permissible as to adjustment, size,character, etc. There does not seem so muchdifficulty in obtaining sensitiveness as inguarding against external electrical disturb-ances. Wings or vanes of thin sheet metalare sometimes attached to the metal ends orelectrodes of the coherer for purposes ofadjustment, their size and capacity beingdetermined by experiment. It is best thatthey present no sharp angles, but be of a disc,or spherical, form, the better not to dissipateenergy. The Oscillator. This is the name given the contrivance atthe ends of the discharger, D being the pointat which the electrical oscillations, or waves,are radiated. Wireless Telegraphy, 259 Clarkes Oscillator. This consists of two brass spheres, gener-ally 3 inches in diameter, and mounted ona stand or sometimes on top of the inductioncoil. The distance between the balls isreadily adjustable by either attaching the. Fig. -jt. Fig. 78. balls on the ends of two sliding rods, orcausing the balls themselves to slide on therods (Fig. jy^. Triple Oscillator. Here three balls are used, two outside onesconnected to the circuit, being one-half inch 26o Wireless Telegraphy, diameter, and the middle one, isolated fromall connection, of three inches in form is best mounted on a separatestand, the balls either being on glass or hardrubber legs (Fig. 78). Connecting wiresfrom the secondary of the coil must in allcases be run with the greatest precautionsagainst crosses, as directed in Chapter V. It is possible to make many differentdesigns in oscillators. Some experimentersuse the simple Clarke form, others preferthe triple balls; yet, again, others vary thesizes and the relative sizes of the ba
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