Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 404
gger, which is attached to the slide-rod orspindle by a fork, thus opening and shutting the valve in the ascent anddescent of the piston. Fig. 180 represents one of the machines attachedsm this instance by a clamp to the frame of a tripod. The principal parts 356 HOCK BORING. of the machine are the… … Fig. i8o.—Burleigh Rock Drill 0}i Tripod. to the reciprocating, it has also a rotary, motion. The drill-point is held ina slip-socket, or clamp, at the end of the piston-rod, by means of bolts andnuts. The drill-point rotates regularly at each stroke of the piston, makinga complete revolution in…
Inventions
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