Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 57
of severalthousand volts by means of the alter-nating current transformer. In asomewhat similar manner, a directcurrent of low voltage can be changedto an alternating current of manythousand volts by an apparatusknown as an induction coil. Fig. 57 is a diagrammatic sketch ofan induction coil. P is… … Fig. 54—^Hot Wire Ammeter with Internal Shunt. contact at C^, closing the circuit of the battery through winding P. In practice sole-noid S is wound about C. When the battery circuit is closed at K, the core becomes saturated with magnetismand attracts the armature B. B being drawn to the end of…
Telegraph, Wireless
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