. Handbook of construction plant, its cost and efficiency. our and thepressure maintained averages 600 lbs. W C+-> O UQ £ o w o >, fJ o S3 a) tu •- ?-iO £ .3 ctf i £° £ Cm* hn fe om bec .« u o Is Eh 02 8^ to oU uo > o E-i u C5 £ C K 00T 02 I jo ajnssaad: jy 1 OS (Suiteh S,.ijj\[) H P,I9(I UIIM J3d 3 jiV eea^ •*£ -no tli bo 60 SB o cs o cri 3 §~1 §I1 In e o « u £ aj 03 p, aj to p+J r* rrt 3 nt r* 3 ^ P. 3*2 s] $bOd «wPn ^--> s £ 3 0) oo: to <3J 50 bo-Pi «C SO-r, ;y;no jo 851BH g 3C aj 3 £3 h : -mcQ u AIR COMPRESSORS 23 Gloucester, Mass., has large areas covered with glacia
. Handbook of construction plant, its cost and efficiency. our and thepressure maintained averages 600 lbs. W C+-> O UQ £ o w o >, fJ o S3 a) tu •- ?-iO £ .3 ctf i £° £ Cm* hn fe om bec .« u o Is Eh 02 8^ to oU uo > o E-i u C5 £ C K 00T 02 I jo ajnssaad: jy 1 OS (Suiteh S,.ijj\[) H P,I9(I UIIM J3d 3 jiV eea^ •*£ -no tli bo 60 SB o cs o cri 3 §~1 §I1 In e o « u £ aj 03 p, aj to p+J r* rrt 3 nt r* 3 ^ P. 3*2 s] $bOd «wPn ^--> s £ 3 0) oo: to <3J 50 bo-Pi «C SO-r, ;y;no jo 851BH g 3C aj 3 £3 h : -mcQ u AIR COMPRESSORS 23 Gloucester, Mass., has large areas covered with glacial boul-ders, which add greatly to the cost of any sort of excavation andhere steam tripod drills, operated by portable boilers, were usedto blast these boulders until March, 1910, when a single stage aircompressor, driven by a 15 H. P. gasoline engine, the wholemounted on a steel truck, was purchased by the city. An aircylinder of 8 x 10 inches gave 96 cubic feet of free air per minute. Fig. 13. Sullivan WK-3 Air Compressor Outfit and SullivanDB-15 Hammer Drills. at 165 revolutions with 80 to 100 lbs. air pressure. A hoistingattachment was mounted on the rear of the truck for pullingrock fragments from trenches, etc. Besides this, the machinewas provided with a gasoline tank, cooling tanks, and an airreceiver. The outfit weighed 8,000 lbs. Hammer drills wereused, and holes 5 ft. deep were frequently drilled in 30 price of a similar machine complete is $1, An outfit like this with 3 hammer drills has been used atYonkers, on similar work. Each drill averaged^50 ft. per dayand the cost of operation was as follows: 3 drill operators at $ per day $ Compressor attendant Gasoline, 15 gallons at 20c Interest, renewals, wear and tear Total cost $ 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$ per day and averaged 5 ft. of hole. = N o w }5 O <
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
