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Compressors built on this system have shown the highest isothermal results, that is, by means of a finely divided spray of cold water the heat of compression has been absorbed to a point where the compressed air has been discharged at a temperature nearly equal to that at which it was admitted to the cylinder.
Four straight-line compressors and one cross-compound Corliss compressor were installed, the steam being supplied by three Stirling boilers. Three electrically-driven air compressors, using current at 6,600 volts, were also installed, and the total capacity of the power-house was about 19,000 cu. ft. of free air per minute compressed to 90 lb. per sq. in. Disposal Pier.
In the construction of connecting machinery by which the movements of a pendulum hanging up from a universal joint may be transmitted to wheels or pistons operating compressors or dynamos, it is necessary to transform all motions passing in any direction through the spherical or bowl-shaped figure traced out by the end of the pendulum in the course of its swinging.
Whatever method is adopted it would be advantageous that the losses of pressure in the pipes connecting the compressors with the motors should be reduced as much as possible, for in this case that loss would represent a loss of efficiency.
We then erected a machine shop, in which we placed our electric engines and air compressors, and built a railroad connecting with the main line, and after we had done that we started the tunnel. As you will observe, the tunnel is a round bore twelve feet in diameter, and no explosives were used in making it.
Hill, in referring to the fallacious tendencies of pneumatic engineers to equalize power and resistance in air compressors, says: "The ingenuity of mechanics has been taxed and a great variety of devices have been employed.
Back and forth they fought, rolling over each other, and every moment burning up more and more of the air that was left to them. Yet at last Captain Jack, aided by the others, succeeded in snatching the wrench from the seaman's inner pocket. "Hold him," cried Benson, getting weakly up, tottering over to one of the compressors.
There is no loss of power in such a case as this, but, on the contrary, the air spring is useful in overcoming the inertia of the piston and moving parts. The best air compressors give a result about midway between the isothermal and the adiabatic, and the net loss of power directly due to clearance is so small as to be practically unworthy of consideration.
No longer did she hurry past his door, with her fingers ready, at the slightest alarm, to act as compressors to her ears; no, the captain's language, though not exactly religious, was eminently proper.
With the best compressors of the dry system one-half of this loss is saved by water jacket absorption, so that we are left with about 11 per cent., which the slow moving compressor seeks to erase. We are quite safe in saying that the element of time alone in the stroke of an air compressor could not possibly effect a saving of more than half of this, or 5½ per cent.
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