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Updated: May 28, 2025
Fifteen minutes later Hal shouted up: "All electric connections appear safe, Captain. And all the air compressors are working." "Are you ready to shut off the gasoline motors?" "Yes, sir." "Go ahead, then, and we'll take a dive." Down they shot below the surface, the boat going on a diving keel.
The low whine assaulting his ears was that created by the air compressors that fed the jets that drove the waters through the rim. Stepping over to the wall locker, Mike took out a dry pair of shorts, a T-shirt, and moccasins, kept there for the purpose of making changes after such swimming inspections of the rim tanks.
Darlington, who is one of the stanch defenders of this class of compressors, has found it necessary to introduce "spray jets of water immediately under the outlet valves," the object of which is to absorb a larger amount of heat than would otherwise be effected by the simple contact of the air with the water-compressing column.
The maximum strains are reduced considerably below those which exist in compressors that do not compound the air. The advantage of the single-acting air cylinder over the double is that it compresses a volume of free air only once every revolution, hence there is a better chance to cool the air during compression.
Kennedy and I remained standing, not far from the outlet of the pipe by which the compressed air was being supplied in the tunnel from the compressors above, in order to keep the pressure up to the constant level necessary. I saw Kennedy give a hurried glance about, as if to note whether any one were looking at us. No one was. With a quick motion he reached down.
The air is admitted to the large cylinder through the piston, is compressed to about 30 pounds, and on the return stroke the pressure is raised to almost any point required, and in proportion to the diameter of the smaller cylinder. Though single-acting, the capacity of one of these compressors is about equal to that of the double-acting machine of the same cost of construction.
As the necessity for compressed air power grew, inventors turned their attention to the construction of air-compressing engines that would combine efficiency with light weight and economy of space and cost. The trade demanded compressors at inaccessible localities, and in many cases it was preferred to sacrifice isothermal results to simplicity of construction and low cost.
As the men went stamping round the capstan, a loud crash was heard. "The messenger has given way, sir," cried Mr Tobin, the first-lieutenant. Out ran the cable to the clench, carrying away the stoppers, and passing through both compressors. At length the messenger was again shackled, and the anchor hove up, when it was found that both flukes had been carried away.
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.
Two systems are in use by which the heat of compression is absorbed, and the difference between one and the other is so distinct that air compressors are usually divided into two classes wet compressors, dry compressors. A wet compressor is that which introduces water directly into the air cylinder during compression.
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