Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 319
of the constructionof the listening and ringing key. The indicators or shutters, a, arepivoted at their edges in cavities formed in the horizontal key-table.Each shutter is provided with a lug, a, upon which bears the free endof a flat spring, b, whose other end is fixed to the frame of a… … FIG. 250.—SUPERVISORY SIGNALS FOR SCRIBNER SYSTEM. armature is attracted, is thrown against the spring, b, thus pushingit out of engagement with the lug, a, on the shutter and allowing theshutter to fall from view. The lever, d, of the listening and ringingkey is connected by a rod, /, with the…
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