File:Design and performance of magnets in the automatic telephone (1912) (14569428588).jpg

Identifier: designperformanc00hays (find matches)
Title: Design and performance of magnets in the automatic telephone
Year: 1912 (1910s)
Authors: Hays, Don Llewelyn Thvedt, Christian Bernhard
Subjects: Electromagnets Electromagnets Telephone, Automatic Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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y the magnets and the time 0f release 0f the same is a.bout the same. The ratio of make t0 break is 0f importance inthe economical and effeotive w0rking 0f the switch. If the timeduring which the oircuit is made is only, say 10% and that forwhich it is broken is ninety percent, then it is found that theolutohes lifting the shaft do n0t have time to operate and there-fore prevent the switch from doing its duty. If n0w the percentof make t0 break is made ninety percent to ten peroent 0f break ,$hen,too, it is found that the switch will n0t w0rk. Tnis, to agreat extent, is due t0 to the residual magnetism 0f the o0re 0fthe magnets, provided that the operation 0f the switch is satis- factory, however, it would seem preferable and more eoonomioal toadjust for a 3horter period of make than of break in order toeoonomize in the use of power, ^he limiting time of make w0uld inin any oase depend upon a number of faotors, and for any given setof magnet3 would have to be found experimentally. (9)
Text Appearing After Image:
Figure 3.Eleotrioal Connections(GreerO BL thumb sorews for adjusting armature to any desired height f0r various sizes 0f magnets.«M« Balance Soales with whioh t0 weigh pan and oontents »T» §i!SS i0.11?1?^ra5° firmly to table or benoh.1 Sorew wnioh threads with nuts IT t0 adiust lengthof air gap 2. J c (10) PART II. Teata on Electro-Magnets in Automatic Telephone SwitoU Aa haa been mentioned before, the moat up-to-date automatiotelephone awitoh oontaina aix aeparate aeta of magnate. In an ef-fort to determine the varioua aotiona characterizing the performanceof the eleotro-magneta in the automatio telephone awitoh, teata weremade, firat, to learn aa aoourately aa poaaible the lifting power ofa aet of magnata for varioua vaiuee of current paaaing thru the coiloonduotora; and aeoond, to aaoertain the power exerted by the magnet3for varioua lengtha of air gap. In order to determine effectively the lifting power of magnetaunder varying oonditiona of voltage, current, and length of ai

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