The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 217
xt 2, andso on to the sixth panel; thenanother row above from left to right, thus building upward.These groups are called the multiple jacks, to distinguishfrom the local jacks arranged along the length of the sectionjust below. The local, or answering, or homespring-jacks are those into which the… … Fig. 217.—Scale & MULTIPLE SWITCH-BOARDS—MAGNETO SERIES 193 board may be looked upon as a collection of Standard boards,with the addition of the multiple-jacks and provision forengaged testing. The indicator drops in connection with the local-jacksare arranged at a lower level, in four groups…
Telephone
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