Notching Coil-Formers
QQNE of the most. popular types of : low-loss coil former consists of two circular or hexagonal end-pieces Joined together by means of six rods which serve to support the windings. In order to get the wire on neatly and with perfectly even spacing it is almost essential to notch the rods in yome way, and one of the best -methods of doing this is to put a screw thread on to them. If a thread with a suitable number of turns per inch is chosen, any gauge of wire can be wound on with the turns regularly | spaced, and once the coil is finished the wire has no tendency to slip.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300221.2.72
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Radio Record, Volume III, Issue 32, 21 February 1930, Page 28
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113Notching Coil-Formers Radio Record, Volume III, Issue 32, 21 February 1930, Page 28
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