Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 41
o distinct set of coils will be seen,one a series winding (SR) in series with the armature and the other a shuntwinding (SH) connected across the main power line. If the current in thesetwo windings circulates in opposite directions, a diflferential field is producedand the resultant field will be… … ELECTROMAGNETIC INDUCTION. 31
Telegraph, Wireless
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