Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 408
a, and is thus guided vertically in ascending and descending. (In thedrawings it is shown at the lowest limit of its travel.) To the top of the drill-spindle is attached the back-weight H by a jointed lever and guide link, whichembraces the top of the spindle and moves upon a vertical guide-rod,… … Scale.—13 fect=7 inches. The drill-spindle is itself screwed towards the middle of its length; it is there embraced by twoscrew-wheels J J between which it turns, and which serve the purpose of a nut to feed down the spindlain the operation of drilling, by an arrangement which will presently be…
Mechanical engineering · Mechanics · Engineering
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