Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 385
1544. DOOR PUSH CHECK.—The spring closes the door. The piston in the cyHnder has a valve to allow quick inlet of air when opening a door, and a small hole adjustable at the bottom of the cylinder for slowly discharging the air. f- -v^ i 1545. FOLDING LADDER.—The rounds arepivoted to the side… … 1546. SIMPLE COMBINATION LOCK.—A number of discs arranged on a spindlehaving a feather key. The discs are notchedto match the notches in the key so that theyreadily turn to be set to the register number torelease the spindle.
Mechanical movements
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