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Core-less induction coils in telephone service (1907) (14732950516)
Summary
Identifier: corelessinductio00smit (find matches)
Title: Core-less induction coils in telephone service
Year: 1907 (1900s)
Authors: Smith, Claude E Stewart, Walter M
Subjects: Induction coils Telephone Telephone systems Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign
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, up to one-hundred an,d-eighty degrees, with reference tothe primary. At ninty degrees the edge of the secondary was restingin the plane ( center of ) of the primary ar. shown in diagram 4, ofcoils. As the angles between the coils became greater, sound becamefainter and fainter although quite distinct and barely audible atnearly ninty degrees. At exactly ninty degrees there ?7as no sound,because at this position the direction of the fxux from the currentin the primary is paraiell to the plane of the secondary. This po-sition v/as quite hard to find and could not be found at all whenone operator was GOunti.;g, and the secondary was moved slowly. Bymaking a buzzing sound inthe transmiter, the positio.. of siiencewas determined, although a movement of a small fraction of one de-gree to the right , or left, of the silence position gave somesound. Beyound ninty degrees sound became louder as the angle in-creased so that at one- hundred and-eighty degrees it was the sameas at zero degrees.
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