. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ifficult todecide, but it would be safe to say that the average cost per yard by eithersystem is the same as far as mining in small tunnels is concerned. Thequestion of large tunnels, such as railway tunnels, need not be consideredhere, nor the use of special carriages for the support of two or moredrills working at the same time, as the usual run of mining operationsis on a much smaller scale. CHAPTER VIII. ROCK DRILLING MACHINERY {continued). Air Compressors—Compressing Plant
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ifficult todecide, but it would be safe to say that the average cost per yard by eithersystem is the same as far as mining in small tunnels is concerned. Thequestion of large tunnels, such as railway tunnels, need not be consideredhere, nor the use of special carriages for the support of two or moredrills working at the same time, as the usual run of mining operationsis on a much smaller scale. CHAPTER VIII. ROCK DRILLING MACHINERY {continued). Air Compressors—Compressing Plant—The Tierrefitte Air Compressor Installation—The Cwmystwith Air Compressing Plant—The Riedler Compressor—CompoundAir Cylinders and Double Stage Compressing—Supporting Columns and Tripodsfor Drills—Steel Bits and Sharpening Tools—The Working of Rock Drills-Specification of a Rock Drilling Plant. Air Compressors.—The machines for compressing air are now builtespecially for that purpose, and may be driven indirectly by the powerof water, electricity, or steam through the intervention of belting or. Fig. ii6.—Schrams Air Compressor Driven by Belting. gearing, or direcdy by steam, in which case the air compressing andthe steam cylinders are usually fixed in one line, tandem fashion, witha piston rod common to both. Of the former type fig. ii6 is an illustration, and may be drivenby a belt from a portable engine, or from a line of shafting, or bygearing from any motor, a fast running being preferable to a slow one. These compressors can be procured in sizes varying by each of cylinder, from one of 8-in. diameter and i6-in. stroke,weighing complete 28 cwt., up to a 22-in. diameter and 30-in. stroke, 169 170 MACHINERY FOR METALLIFEROUS MINES.
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