The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 351
im-proved, originated from the various inventions whichculminated in the invention of the improved quadruplexsystem. Its two principal instruments are the pole-changer 3.n6. polarized differ€7itial relay, the latter the in-vention of Dr. Siemens. 334 DYNAMIC ELECTRICITY AND MAGNETISM. The… … Fig. no. this lever projects, without contact, through an openingin a metal disk D, and has a free vertical movement be-tween two curved, metal springs s and s, connectedWith opposite poles of the main battery; s being, for THE ELECTRIC TELEGRAPH. 335 convenience, supposed to be connected with the…
Electricity · Magnetism
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