Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 139
The horizontal screw a a, working into a nut in the foot of the upper screw-frame, effects the horizon-tal or traversing movement of the jack, the frame of the lower screw serving as a bed or slide for thelatter movement. A ratchet-lever may be used to work either of the screws instead of a crank.…
Mechanical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
