. Handbook of construction plant, its cost and efficiency. lbs. and costs $60; with compass, $ Thetripod weighs 6 lbs. An engineers dumpy level with 15 to 18-in. telescope, weighsiy2 lbs. and costs $100. The tripod weighs 8 lbs. An engineers railroad Y level with 15 to 18-in. telescope weighs10 lbs. and costs $110. The tripod weighs 8 lbs. An engineers Y level with 15 to 18-in. telescope weighs 11 costs from $100 to $150, averaging $135. The tripod weighs9 lbs. Precision levels with 18-in. telescopes, weighing 12 pounds, costfrom $150 to $300. Tripods weigh 9 to 15 lbs. LIGHTS So
. Handbook of construction plant, its cost and efficiency. lbs. and costs $60; with compass, $ Thetripod weighs 6 lbs. An engineers dumpy level with 15 to 18-in. telescope, weighsiy2 lbs. and costs $100. The tripod weighs 8 lbs. An engineers railroad Y level with 15 to 18-in. telescope weighs10 lbs. and costs $110. The tripod weighs 8 lbs. An engineers Y level with 15 to 18-in. telescope weighs 11 costs from $100 to $150, averaging $135. The tripod weighs9 lbs. Precision levels with 18-in. telescopes, weighing 12 pounds, costfrom $150 to $300. Tripods weigh 9 to 15 lbs. LIGHTS Some construction work must be done at night, and much ofit can be expedited if certain portions are done after the regularday shift has knocked off. For instance, a macadam road must be finished in a limitedtime, the road to be surfaced is straight-away from the quarry,dock or siding where the stone is procured and the only econom-ical way of hauling the stone is along the finished road. It isalmost impossible, or at least very difficult, to use more than. Fig. 170. one gang. In such a case it is obvious that if the stone is un-loaded, hauled and spread at night the work will be is no reason why this should not be done. Proper lightsare necessary however. Many steam shovels, cranes and derricks are operated at offers no obstacle to the working of cableways, beltconveyors and other conveying machinery if the loading andunloading places are properly illuminated. The means of light-ing work may be anything from candles to electric light. Kero-sene consumes five times and candles seven times as muchoxygen as acetylene. Kerosene gives off nine and candles tentimes the product of combustion given off by acetylene. Thelight of kerosene and candles is obscured by the smoke given offby them; whereas, the light of acetylene and electricity is notthus interfered with. 397 HANDBOOK OF CONSTRUCTION PLANT CONTRACTORS LIGHTS AND TORCHES. Contractors lights are
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
