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Updated: May 7, 2025
They was usin' three of these pneumatic drills and they sure were ripping it up slick and speedy. About then I noticed that their compressor was chugging away nearly opposite me and that the lines of hose stretched out fifty feet or more. "Say!" says I jerky and breathless, but to nobody in particular. I was just registerin' the fact that I'd had a sudden thought.
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.
We find this by following down the first line intersected by the adiabatic curve to the point where the zero heat curve intersects this same line, the reading being given in figures to the left immediately opposite. If the air had been admitted to the compressor at 60 degrees, it would register about 176 degrees at 14.7 pounds gauge pressure.
"Now then, we'll cast off them jib halyards an' make 'em fast.... Right-O.... Now stand by to brace the foreyard. Bart, for the love o' heaven, help me with this foreyard brace." With the aid of the winch, they braced the foreyard; then McGuffey ran aft and took the wheel while Mr. Gibney scuttled forward, eased up the compressor on the windlass, and permitted the anchor chain to pay out rapidly.
The explosions Joe had seen looked as if they'd centered in the fire basket technically the combustion area behind the compressor and before the drive vanes. A jet motor whirled. Its front vanes compressed air, and a flame burned furiously in the compressed air, which swelled enormously and poured out past other vanes that took power from it to drive the compressor.
Ammonia requires heat to expand and turn into vapour, and this heat it extracts from the substance surrounding it. In this marine refrigerating machine the ammonia got the heat from the brine in the tank, then it was drawn by a pump from the pipes in the tank, compressed by a power compressor, and forced into a second coil.
Gothard tunnel, begun in 1872, Prof. Colladon first introduced the injection of water in the form of spray into the compressor cylinder to absorb the heat of compression. This compressor was exhibited at the Centennial Exposition and was adopted by Mr. Sutro in the construction of the Sutro tunnel. A characteristic feature seems to be to get as much water into the cylinder as possible.
While the volume of compressed air furnished by this compressor would be somewhat reduced by the restriction of the water, yet the increase in speed which was obtained without any increase of power fully compensated for the clearance loss. Mr.
A dry compressor is that which introduces no water into the air during compression. Wet compressors may be subdivided into two classes. Those which inject water in the form of a spray into the cylinder during compression. Those which use a water piston for forcing the air into confinement. The injection of water into the cylinder is usually known as the Colladon idea.
In other words, a duplex air compressor would be identical with a duplex steam engine were it not for the fact that air cylinders are connected to the steam piston rods. At this point of the stroke the opposite steam cylinder has a reduced steam pressure and is doing little or no work, because the opposite air cylinder is beginning its stroke.
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