Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 488
ter to the drill-head. A rapid re-volving movement iscommunicated to thedrill-spindle by thegears shown. Thespeed and feed move-ment may be regu-lated by the operatorwith reference to thehardness or softness,coarseness or fineness, of the material to be bored ; and thefeed movement may be instantly… … Fig. 16.—Diamond Gadder. 4io STONES FOX BUILDING AND DECORATION. driven by a double-cylinder engine. A continuation of oneof the piston-rods through the cylinder forms the plunger to a small pump placed abovethe cylinder, which supplieswater to the boiler and alsoforces it through the drill-spindle…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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