Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 31
Fig. 16—Magnetic Field of Horse-shoe Magnet withCurrent Flowing in Definite Direction. … Ill in Fig. 17—Showing How Magnetic Field Reverseswith Reversal of Current. The direction of the current induced inS should be observed. When the lines offorce increase through S, the induced pres-sure is counter to that which originallyflowed in winding P, but when the linesof force decrease…
Telegraph, Wireless
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