Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 552
a small tip projecting throughthe upper finishing plate of the key just between the listening camand the first ringing plunger. This locking plate engages a pro-jection on each ringing plunger which prevents a depressed plungerfrom returning to its normal position of rest, and holds it… … FIG. 3S0.—STllIP OF ORDER-WIRE KEYS turn to their full height, except the one last used. The operator thusmay learn by touch, as well as by sight, which station on a line wasrung last. By pressing the locking plate tip projecting near thelistening cam, all plungers may be released. In this key, as…
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