Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 55
the poles of the horse-shoe magnet, N, S, N, S, etc. A number of small vibrating reeds are placed directlym the path of the flux between the soft iron piece and the poles of the magnet Eachof these reeds have a dififerent period of mechanical vibration and, consequently areonly set into vibration… … ELECTROMAGNETIC INDUCTION. 45 state of magnetization, but when alternating current flows through winding M, thereed having a natural period corresponding to the particular frequency of the currentflowing will be set into violent oscillation. The scale reading corresponding to this particular reed…
Telegraph, Wireless
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