The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 540
ottom. The finger is then removed, and a clock mechanismreturns the dial steadily back to its normal position, carry-ing with it the toothed earthing wheel, and causing the vertical line to be earthed 5 times, and the rotary A UTOMA TIC EXCHA NOES 5 line to be earthed once, by the odd tooth. The… … Fig. 472Front View- Automatic Selector
Telephone
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