Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 414
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.—12 feet=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 spindlein the operation of drilling, by an arrangement which will presently be…
Mechanical engineering
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