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 491
o insertto a considerable distance beneath the surface a bar of iron, fig. 3063, having at its lower extremity abroad plate, or disk of metal, in a spiral or heUcal form, on the principle of the screw, in order that itshould enter the ground with facility, thrusting aside any obstacles to its… … Whether this broad spiral flange, or ground-screw, as it may be tenned, be applied to the foot of apile to support a superincumbent weight, or be employed as a mooring to resist an upward stniin, itaholding power entirely depends upon the area of its disk, the uatm-e of the ground into which it if…
Mechanical engineering · Mechanics · Engineering
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