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 708
The rota-tion-bar is nearly triangular in cross-section, and is made very strong. The ratchet-wheel for rota-tion is large, and the teeth are strong. Fig. 3693 represents this drill supported on an ingeniously constructed column for use in headings.It will be noted that the column may be adjusted… … can also be used as a ccal-cutting machine. Fig. 3695 exhibits the drill mounted for doing quarry work. A straight line of holes 8 ft. in length can be put down without moving the machine, all the holes having the same direction. The Rand air-compressor, used to supply air under pressure to the…
Mechanical engineering -- Dictionaries
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