The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 385
from subscribers, to each of whom oneis assigned. They are constructed with hinged brasstablets, each having the subscribers number on its innerface, and connected with an electromagnet by which aspring catch is operated, which keeps the tablet closedwhen not in use. When a subscriber transmits a… … Fig. 120. THE TELEPHONE. 369 drops into a horizontal position and displays the sub-scribers number. In compartment B are shown the flexible conductingcords for making connection with the subscribers lines,kept stretched by suspended pulleys to prevent en-tanglement; each attached to a plug shown in…
Electricity · Magnetism
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