Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 483
moving over a steel-rail trackwhich is placed on the quarrybed. It carries a single gang-drill on one side, or twosuch drills—one on eachside. These are raised and dropped by a lever and crank ar- the upper end. Then standing upright on the block of stone he lifts the jumperallowing it to fall… … Fig. xi.—Improved Quarky Bar. MACHINES AND IMPLEMENTS USED 405 rangement. The gang of cutters forming the drill is composedof five steel bars, 7 to 14 feet in length, sharpened at theend and securely clamped together. Of the five cutters,two have diagonal edges ; the other three their edges…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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