. Factory and industrial management . om 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, trace
. Factory and industrial management . om 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 inthe hands of the machine comprises acylinder or shell six incheslong, which contains a solidpiston or hammer recipro-cating very rapidly andstriking the end of thechisel about ten thousand blows per minute. As a yxg. i6. air-compressor plant on theman cannot swing a heaw u. s. monitor THE USE OF COMPRESSED AIR. 669 J UafhtrWathtre Toot Woihtr hammer continuously more thanthirty times per minute, one canhardly imagine the great increase inthe capacity of a skilled artisanequipped with one of these handylittle tools (Fig. 17). In nearly all manufacturing andmercantile pursuits more or less lift-ing of goods is necessary. For hoist-ing purposes compressed air is un-rivalled, both in speed and air can be obtained at anexpense of 3I2 cents (for compress-ing) to lift a weight of 2,500 poundsfour feet one hundred times. Sucha hoist (Fig. 18) is a very simplecontrivance, being nothing but acylinder, made of a section of pipe closed at both sides and fitted witha piston whose rod, terminating in a hook, projects through a stuffingbox in the bottom cover of the hoist. Air is admitted through a flex-ible-hose connection to the lower side of the piston, and lifts whateverweight may be attached to the hook. By suspending the
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
