| 21. | The necessary high voltage, typically 10, 000 volts, is supplied by an induction coil or transformer.
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| 22. | The early Swedish-designed devices used rechargeable batteries, which were charged by an induction coil from the outside.
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| 23. | Induction coils were used to provide high voltage for early gas discharge and Crookes tubes and other high voltage research.
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| 24. | A nozzle releases a puff of gas which spreads across a flat spiraling induction coil of wire about 1 meter across.
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| 25. | The induction coil can be placed outside thermal insulation, so it operates at low temperature and has a long life.
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| 26. | In this process, the current to weld the pipe is applied by means of an induction coil around the tube.
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| 27. | :: : : : Two problems : 1 ) the induction coil would still be going at the same frequency!
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| 28. | On the outside of the patient's scalp rests the corresponding induction coil and an antenna that sends the receiver.
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| 29. | The engine operates contact breaker points, which interrupt the current to an induction coil ( known as the ignition coil ).
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| 30. | His first transmitter consisted of an induction coil connected between a wire antenna and ground, with a spark gap across it.
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