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 705
15 per cent, can be effected by two-hand drilling over one-hand drilling; this is especially the casewith 10-hour instead of 8-hour shifts. This saving is, however, made in cost alone, as one-handdrilling gives the more rapid advance, and should be used even in the harder rocks, where speed isan…
Mechanical engineering -- Dictionaries
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