Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 296
riodic telephone currentwill be less varying as the relative amounts of positive and negative current admitted tothe telephone by the tone wheel. To produce a note of audio-frequency from the Tuckerton transmitter at its present wavelength, a toothed wheel interrupter having 800 contact segments… … 286 PRACTICAL WIRELESS TELEGRAPHY. The tone wheel is frequently termed a frequency transformer because it converts me-chanically the oscillations of radio-frequency into current of audio-frequency. It is superiorto the ordinary tikker, first, because it produces a musical pitch so highly desirable…
Telegraph, Wireless
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