Notes on electricity and magnetism. designed as a companion to Silvanus P. Thompson's Elementary lessons (1891)
Murdock, J. B. (Joseph Ballard), 1851-1931, Thomson, Silvanus Phillips, 1851-1916 · New York, Macmillan & Co. · leaf 146
ron armature, pivoting at the pointP. When the current passes, this lever touches the stopD and closes the local circuit DXLSYP through the ELECTRICITY AND MAGNETISM. 133 sounder S. When the line current ceases, the lever Vis drawn back by the spring and contact at D is broken.Whenever, therefore,… … ~Fig- 35.—Relay. direction, the relay works for every signal from which eveiway it may come. In the open-circuit system a relay isnecessary for messages in each direction. The WesternUnion relay is shown in Fig. 35. The printing receiver or embosser is but little used inAmerica, messages being read…
Electricity · Magnetism
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