The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 174
at one time much usedfor automatic junction-lineworking, but, being some-what unreliable, have now been almost wholly displaced byrelay and electric-lamp working, which has also displaced theother forms of self-restoring drops. These lamps will bedescribed in Chapter XI. Horizontal Visual… … Fig. 166 i5o PRACTICAL TELEPHONE HANDBOOK shown in Fig. 166, the magnet is fixed in a vertical position, with the armature A pivoted at P at the bottom. A long lever attachment, l l, is fixed to a, KEY SHELF 7 and bent at the top. When A isattracted, the end of l presses on abent lug attached to a…
Telephone
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