Handbook of construction plant, its cost and efficiency (1918)
Dana, Richard Turner, 1876-1928 · New York, McGraw-Hill book company, inc., [etc., etc.] · leaf 28
6.00 Total cost $23.00 This gives a cost of 14*^ cts. per ft. of hole. The work wasformerly done by hand at 30 cts. per ft.; each man received$1.50 per day and averaged 5 ft. of hole. ^^fj^s •c a < •< >< ^ ji. , , o Oi v«-*IN^?»? *& i^to^ *<^ >i as TS§§ V > I 1 1 1 » *|nW»… … 1 24 AIR COMPRESSORS 25 Directions; 1. If the drills are not of the 3-in. size, find out the number of3-in. drills which equals the drills proposed for use. The diagramof Relative Capacity of Rock Drills is for this purpose. 2. Observe the height above sea level. 3. Determine the air pressure that…
Contractors' operations · Building
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