Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 28
iron within it. In order that the phenomena of electromagnetic induction to be explained latermay be better understood, the expansion and contraction of the magnetic fieldaround a current carrying coil should be considered. If direct current of unvary-ing strength flows through the solenoid, the… … Fig. 12a—Showing Lines of Force Around a Conductorwith the Current Flowing Away from Reader. 18 PRACTICAL WIRELESS TELEGRAPHY. way, when the current rises, the lines of force move away from^ the wire hutwhen the current falls, the lines of force collapse back upon the wire. The general direction of…
Telegraph, Wireless
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