Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 385
f-i Z^r -. vt I 1545. FOLDING LADDER.—The rounds arepivoted to the side pieces, which are recessed toenclose the rounds when the ladder is shut. … 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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