Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 44
ing in and out of a coil of wire wound over an iron core caninduce a flow of current into another coil wound about it. Mention was made ofthe fact that direct, current flowing through the first coil must be interrupted orits strength changed periodically to induce a current in the second coil. It… … Fig. 34—Development of Wave Winding. in winding S increases or decreases accordingly as the number of turns in S aregreater or less than in P (see paragraph 31). The apparatus built upon this principle is known as a transformer_ and thedifferent types are called step-up or step-down with respect to…
Telegraph, Wireless
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