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Image from page 57 of “Robison’s Manual of radio telegraphy and telephony for the use of naval electricians” (1918)
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Title: Robison’s Manual of radio telegraphy and telephony for the use of naval electricians
Year: 1918 (1910s)
Authors: Robison, S. S. (Samuel Shelburne), b. 1867 United States Naval Institute Todd, David Wooster Hooper, Stanford Caldwell
Subjects: Telegraph, Wireless — Handbooks, manuals, etc Telephone, Wireless — Handbooks, manuals, etc Radio — Handbooks, manuals, etc
Publisher: Annapolis, Md. : The United States Naval Institute
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN
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Text Appearing Before Image:
Fig. 29. The secondary winding of tlie transformer is of many turns, in orderto give a high potential. The transformer also has an iron core. Thegreat number of turns of the secondary winding, added to the effectproduced by the iron core, gives the circuit containing the secondarywinding and the condenser a very large self-induction, and consequentlya very long period. The circuit composed of the condenser, self-induc-tion, and sparh gap has a very much shorter period, and when the sparkgap is ruptured this circuit oscillates as if it were entirely disconnectedfrom the secondary, usually completing its oscillations and coming to restin a fraction of the period of the circuit formed ])y the secondary andcondenser. The oscillating circuit (condenser, spark gap, and inductance) isshown in fig. 29 near a conducting wire, having a few turns of inductanceclose to those of the oscillating circuit. In this circuit we can consider 52 MANUAL OF RADIO TELEGRAPHY AND TELEPHONY.
Text Appearing After Image:
Pig. 11. ^LABY ARCO TO AEfflAUi the condenser as representing the source of current, like the battery infig. 11, art. 13; the spark gap as the break K, the turns of inductancein the oscillating circuit as A B, and the opencircuit with one end grounded as C D. Theoscillating currents in A B produce like cur-rents, but in the opposite direction in C D (art.12), and C D becomes a source of ether waves.75. The production of ether waves and their^^ detection at a distance from the source constitute \^^^___^fe-= ;£=;==– wireless telegraphy. 1^ ^ U C D is usually called the open or radiating circuit or aerial circuit. A B the closed or oscillating circuit.The two inductances in A B and C D form the primary and secondary,respectively, of an air-core oscillation transformer (art. 27). Whenarranged as in fig. 29, A B and C D are said to be inductively connected.Or C D may have part of its inductance common to A B. The arrange-ment in this case acts as an auto-trans-former, and the circuits ar
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