Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 491
rtto 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 helical form, on the principle of the screw, in order that itshould enter the ground with facility, thrusting aside any obstacles to its descent,… … _ Whether this broad spiral flange, or ground-screw, as it may be termed, be applied to the foot of apile to support a superincumbent weight, or be employed as a mooring to resist an upward strain, itsholding power entirely depends upon the area of its disk, the nature of the ground into which it…
Mechanical engineering
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