Pneumatic Rock Drill
It consists of a steam cylinder and piston and its rod, and to the rod is firmly secured a steel rock-drill. The cylinder is supported upon a heavy tripod that may stand in any position and present the point of the drill in any direction. The steam or compressed air is conveyed to the cylinder through a hose, and when ready for work it delivers its tremendous thundering blows upon the rock in rapid succession.
Keywordsbore, hole maker, auger, jackhammer, drilling tool, jack hammer, pneumatic rock drill, break up
Charles Barnard Tools and Machines (New York, NY: Silver, Burdett and Company, 1903)