Handbook of construction plant, its cost and efficiency (1918)
Dana, Richard Turner, 1876-1928 · New York, McGraw-Hill book company, inc., [etc., etc.] · leaf 261
ng time, orpractically 10 in. perminute. This, ofcourse, did not includethe time of gettingready for a new holeor blowing out the oldhole, both of whichoperations could eas-ily be accomplishedin 30 seconds by anaverage operator. Thisexample is given toshow the adaptabilityof these small… … Fig. 89 B. 258 HANDBOOK OF CONSTRUCTION PLANT lbs. with drill running. The former pressure represented thepressure at the compressor. In this drill some of the exhaustgoes down through the bit and blows the rock cuttings up outof the hole, producing a heavy cloud in a strong wind. SUBMABINE…
Contractors' operations · Building
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