. Handbook of construction plant, its cost and efficiency. Expense of delivering timber Carpenter work on mast and boom at $ a day Derrick irons, sheaves 2,400 of best galvanized 1 iron rope for 8 guy Thimbles, clamps, etc 500 steel hoisting rope, 1% Labor on dead men, 4 men, 2 days at $ Labor raising derrick, 8 men, 2 days at $ Labor fixing guys, 8 men, 2 days at $ Total $ 194 HANDBOOK OF CONSTRUCTION PLANT Stiff-leg derrick complete capable of operating %-yard clam-shell bucket on a 50 boom. Equipped with 8
. Handbook of construction plant, its cost and efficiency. Expense of delivering timber Carpenter work on mast and boom at $ a day Derrick irons, sheaves 2,400 of best galvanized 1 iron rope for 8 guy Thimbles, clamps, etc 500 steel hoisting rope, 1% Labor on dead men, 4 men, 2 days at $ Labor raising derrick, 8 men, 2 days at $ Labor fixing guys, 8 men, 2 days at $ Total $ 194 HANDBOOK OF CONSTRUCTION PLANT Stiff-leg derrick complete capable of operating %-yard clam-shell bucket on a 50 boom. Equipped with 8 bull wheel, guidesheaves, framed complete with all irons. Boom 12 x 12 x 50;mast 10 x 10 x 32; stiff legs 10 x 10, framed 10 horizontalto 12 vertical; sills 10 x 10. Price, $ f. o. b. N. Y. RIGGING FOB STIPP-IEG DERRICK 1 14 single block with shackles $ 1 14 double block with shackles 310 of 4 part topping line 115 of 4 part bull-wheel line with clips 425 of % C. C. S. wire rope 300 of 3 holding and closing line Total $ Fig. 79. Derrick fittings bought for second-hand derrick of similardescription as above for use with 3 drum hoist and a clam shellbucket -cost as follows: 1400 lineal feet %x6xl9 crucible steel W. R. cable $ 3 14 double bronzed bushed blocks at $ 1 14 single bronzed bushed blocks 2 12 sheaves bronzed bushed blocks at $ 12 guy clamps and bolts for % rope at 24c 1 12 snatch block bronze bushed Total $ A car provided with an A frame, a hoisting engine and lightjack arms, capable of lifting 5-ton boulders, etc., costs from$1,500 to $2,000 new. See Fig. 79. DERRICKS 195 IRONS FOR POWER-OPERATED STIFF-LEG DERRICKS The following- list, to accompany Fig. 80, enumerates the mostimportant metal parts of stiff-leg derricks to be operated bypower. It does not include guide sheaves, blocks, or otherrunning gear.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
