The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 176
n theplug, so as to carry the shutter to its normal position, as shownin Fig. 167. Another form of this kind of apparatus is shown in Fig.168, in which the bottom long-line spring of the spring-jack ahas a kind of stirrup loop formed on its end. This is bent up-ward so as to intervene between the… … Fig. 168 piece passes inside the top of the stirrup loop. When theanswering plug is pressed into the j ack, the sleeve of the plugforces down the spring a, and the stirrup loop moving downwith it, bears on the shutter projection, and raises the shutteruntil it is held by the armature-lever catch c.…
Telephone
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