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Updated: May 28, 2025
You can drive me to the airport at Cambridge and pick me up when I come back. That will leave you a car, and you can use the motorboat for exploring or for fishing. If you feel like skin diving, you can try for rock or hardheads off the northern tip of Taylors Island, right at the mouth of the river. Did you bring gear?" "The whole set," Rick replied. "Lungs, compressors, guns, and even suits."
We hear a good deal about "Centrifugal Air Compressors," "Rotaries," "Plunger Pumps," etc., designs involving expensive complications without any heat advantage, and which seem to be based upon the "iridescent dream" of a large loss in the present method of compressing air.
Hydraulic piston compressors are subject to the laws that govern piston pumps, and are, therefore, limited to a piston speed of about 100 feet per minute. It is quite out of the question to run them at much higher speed than this without shock to the engine and fluctuations of air pressure due to agitation of the water piston.
As it is very expensive to make compressed air by steam power, the pressure pipe will be tapped at the level of the Sutro tunnel, and a stream of water taken out that will be used in running a turbine wheel of sufficient capacity to drive three air compressors. As there will be a vertical pressure upon the turbine at this depth of over 2,000 feet, a large stream of water will not be required.
"T minus one and counting...." Bessie continued officially. "Fifty, forty, thirty, twenty...." The faint whine of high-speed centrifugal compressors could be heard through the ship. "Ten...." The jets that had previously bubbled almost inaudibly took on the sound of a percolating coffee pot. "... Four, three, two, one, mark."
The purpose of these is to supply a base which can keep on the move with the same degree of facility which the submarine itself possesses. These tenders are equipped with air compressors by means of which the air tanks of submarines can be refilled. Electric generators make it possible to replenish the submarine storage batteries.
Angular positions of the cylinder involve expensive construction and unsteadiness. Experience has conclusively proved that it does not pay to build air compressors with vertical cylinders, and moreover we have found out that there is nothing in the apparent difficulty in equalizing the strains in a direct-acting engine.
Although the Argonaut travelled over 2,000 miles under water and on the surface, propelled by her own power, her inventor was not satisfied with her. He cut her in two, therefore, and added a section to her, making her sixty-six feet long; this allowed more comfortable quarters for her crew, space for larger engines, compressors, etc.
The terminal strain, which is so severe in air compressors, is here considerably reduced, as in this case it is only equal to the area of the initial air piston multiplied by its low air pressure. Economical results are attained with this compressor at low cost of construction.
There were sketches of the compressors, sketches of the mechanism by which the compressed air was forced into the tanks to drive the water out in fact, sketches of many vital features in the control of the boat. Nor was more than a glance needed to make it plain that this young woman artist possessed expert knowledge of machinery. At the cry of "rat" three or four women jumped from their seats.
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