Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 285
na system may be maintained, it becomes important that the fre- 274 PRACTICAL WIRELESS TELEGRAPHY. quency of the alternator may remain constant; in consequence, the speed of thedriving motor must be carefully governed and to this end sevesal devices havebeen brought forth, the principal one being a… … Fig. 285—Marconis Method of Generating Continuous Oscillations. Signalling is accomplished, in the Joly system, by inserting a key in series with the directcurrent excitation winding, or by interrupting the generator circuit to the primary windingof the transformers by a special electromagnetic…
Telegraph, Wireless
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