Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 466
his class of mortising machine isshown in Fig. 3111. The spindle carrying the chisel is arranged by suitable mechanical movementsto make one quarter turn while reciprocating at the upper end of its movement; thus the cutting edgeof the chisel is brought at will to bear upon either side or end of… … sash, blind, and door mortising. It has a novel compound bed, on which the stuff to be worked isclamped and moved under the chisel by a rack and pinion, the treadle raising the bed so that thechisel enters the wood gradually. The tool works in deeper at each stroke until the desired depth is 446…
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