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 87
/ / VWi … Tlie holes were bored two feet below the proposed bottom of the dredging, as it was expected thateach shot would dislocate, or break into small pieces, a mass of marl of a conical or parabolic form, ofwhich the bore-hole would he the centre, and its bottom the apex, so that four adjoining shots…
Mechanical engineering · Mechanics · Engineering
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