Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 174
cutting 152 AMERICAN TELEPHONE PRACTICE. of the two surfaces. The extent of this cutting, even where thepressure is very hght and the movement very Hmited, is often as-tonishing. In Fio-. 133 is shown the hook-switch now almost universallyused by the Bell Telephone Company, and known as the… … FIG. 129.—BRIDGING DESK SET CIRCUIT—COIL ON RACK. insulating pin, h, and a contact point, i. A spring screwed to thegenerator box under the lever by the screw, b, bears alternatelyupon the insulating pin, h, and the contact point, i, and tends topress the lever into its elevated position. Springs,…
Telephone
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