. Factory and industrial management . FIG. 14. COMPRESSED AIR IN FOUNDATION WORK. SINKIN(; A CAISSON FOR THEFOUNDATION OF THE AMERICAN SURETY BUILDING, NEW YORK CITY. being filled by the water and soft earth or mud that otherwise wouldprevent the men from working. It also operates the rock drills, andserves to ventilate the caisson work. With proper precautions a per-fectly healthy man can work under an air pressure ot seventy-fivepounds per square inch, though forty pounds is rarely exceeded in or-dinary work. In wrecking operations compressed air is employed to force outthe water from numero
. Factory and industrial management . FIG. 14. COMPRESSED AIR IN FOUNDATION WORK. SINKIN(; A CAISSON FOR THEFOUNDATION OF THE AMERICAN SURETY BUILDING, NEW YORK CITY. being filled by the water and soft earth or mud that otherwise wouldprevent the men from working. It also operates the rock drills, andserves to ventilate the caisson work. With proper precautions a per-fectly healthy man can work under an air pressure ot seventy-fivepounds per square inch, though forty pounds is rarely exceeded in or-dinary work. In wrecking operations compressed air is employed to force outthe water from numerous barrels or bags which are attached by diversto a sunken vessel, thereby furnishing the buoyancy necessary to bringthe vessel to the surface. The use of compressed air on board the United States monitorTerror, for turning the turrets, working the guns and ammuni- 668 THE USE OF COMPRESSED FIG. 15. COMPRESSED AIR IN BRIDGE WORK. BUILDING PIER OF CANTILEVER THE NEEDLES, CAL., ON A CAISSON SUNK 64 FEET BELOW WATER LEVEL. tion hoists, and operating the steering gear, makes this floating engineof destruction one of the most notable vessels in our navy. (Fig. i6.)The whole stone trade, from the first operation of quarrying to thefinished carvings, has been revolutionized by the use of compressedair. In fact, the introduction of air-operated machinery is about theonly marked improvement in handling stone that has been broughtforward since the stone age. The channeling machine cuts out blocksin the hard unyielding masses of stone in much the same manner aswe cut squares of cheese with a knife. This process obviates the useand expense of explosives and the enormous Avaste of material, insep-arable from blasting. All the finest carvings, tracery, and letteringon both building and monumental work is done by means of a smallpneumatic engine weighingabout two pounds, held
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
