The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 169
Sectional Elevation at JCy. Fig. 155.—Full size can then be adjusted comparatively close to the cores, butmust be prevented by non-magnetic core-pins from actuallytouching when attracted. The Western Electric Co.s two-coil drop is constructed xf /»_ P … Fig. 156 on this principle, and has been very extensively used. Fig.155 is a sectional side view, showing only one coil of thehorseshoe electro-magnet; Fig. 156 is a plan; and Fig. 157 SWITCH-BOARD APPARATUS HS a front elevation of two shutters, d is the drop shutterpivoted at the bottom ; c a…
Telephone
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