Transactions . tted. On the other hand, thecompensator-plunger has a number of slots, which, in case thestroke becomes longer than normal (that is, if the clearancebecomes less than f in.), overrun the bearing of the plungerand open a by-pass for the column of water which is pushingthe plunger forward. Thus the pressure on both sides isequalized, and the pistons are prevented from striking thecylinder-head. Of course, this device comes into play onlywhen the load is suddenly released. Under ordinary condi-tions, that is, with f-in. of clearance in the steam-cylinder, theby-pass in the compensa
Transactions . tted. On the other hand, thecompensator-plunger has a number of slots, which, in case thestroke becomes longer than normal (that is, if the clearancebecomes less than f in.), overrun the bearing of the plungerand open a by-pass for the column of water which is pushingthe plunger forward. Thus the pressure on both sides isequalized, and the pistons are prevented from striking thecylinder-head. Of course, this device comes into play onlywhen the load is suddenly released. Under ordinary condi-tions, that is, with f-in. of clearance in the steam-cylinder, theby-pass in the compensator will not open. The machine here illustrated is a small one. In larger sizes,the dAuria compressors are made compound, both in air andsteam, and fitted with the most approved steam- and air-valves 116 THE DAURIA AIR-COMPRESSOR. to insure economy of steam. A dAuria compressor of 3000cu. ft. capacity per minute, compound in steam and air, withinter-cooler all complete, weighs about 46,000 lbs., occupies a CO 6. floor space of 25 by 8 ft., requires no other foundation thana floor to support its weight, and does not need even to bebolted to the floor. A compressor of the crank and fly-wheel ill i: i>.w ria AIK-00MPBB8S0B. 1 1 7 type, capable of doing equally efficient work, and of the samecapacity, would occupy a floor-space of aboul 56 by Is ft., andits fly-wheel alone would weigh 45,000 lbs., the total weight ofthe machine being probably about 170,000 lbs. WTiere spare is a consideration, the new type offers consider-able advantages, occupying only one-fifth as much area as theformer type. In weight, it La as one to four, involving muchsaving in the cost of foundations, which is an important , it can be moved from place to place without anytrouble, being, in the full sense of the word, a portable matter what its size, it will always start and stop promptlyby opening or throttling the steam, without any dead center. The principles involved in the dAur
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
