The instrument is knownas an inditction coil. When the current is turned on, itpasses through the platinum point, A^ to the hammer, //,and through the primary coil, P, which is an electro-mag-net, and back to the battery. The current magnetizes Pand this draws H away from A, thus breaking the… … Fig. 112. alternately closing and opening the circuit. By this actiona current is set up in the primary coil and an induced cur-rent in the secondarycoil, vS, which lies inthe field of the electro-magnet. The primarycoil consists of a fewturns of coarse wire, andthe secondary of manyturns of fine…
Physics
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