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In high-tension circuits over which such pressures as 50,000 volts is transmitted, no little difficulty is experienced from leakage and consequent loss of energy. This leakage occurs both between the line conductors and at the insulators placed on the pole lines forming the line circuit.
By far the most serious obstacle to water injection, and that which condemns the wet compressor, is the influence of the injected water upon the air cylinder and parts. Even when pure water is used, the cylinders wear to such an extent as to produce leakage and to require reboring. The limitation to the speed of a compressor is also an important objection.
Another source of leakage on an estate, and not an inconsiderable one, arises from tools not being sharpened over night, or by some one before the arrival of the people, and nothing is more common than to see a group of coolies hanging round the grindstone in the morning waiting to have their axes or knives sharpened.
Good Pails and other Vessels, free from Leakage, are likewise made thereof. The Bark of this and the red Cedar, the Indians use to make their Cabins of, which prove firm, and resist all Weathers. These Trees are the largest for Height and Thickness, that we have in this Part of the World; some of them holding thirty-six Foot in Circumference.
About three months ago it was bitterly cold, but they are used to outdoor life, and this is no worse than they have always been used to. The tents are all military tents, and there is no sign of leakage. I know they all want tents when they come here, if it is possible to get them. On the whole, the inmates are contented, and the children are particularly happy.
The escape would not occur instantly, nor all at once, for it would be only the molecules at the upper surface of the atmosphere which were moving with their greatest velocity, and in a direction radial to the center of the moon, that would get away; but in the course of time this gradual leakage would result in the escape of all of those gases.
Friedrich rides up to view the Zabern Hollow: "Beyond expectation deep; very boggy too, with its foul leakage or brook: no attacking of their western flank through this Zaberngrund; attack the corner of them, then; here on the southwest!" That is Friedrich's rapid resource. The lines halt, accordingly; make ready.
The attention of our travellers was now directed to numerous squares and plateaus of great black objects buried in seaweed; these, they were informed, were casks of oil, stored in this manner instead of in warehouses, as less liable to leakage.
Deane's house in Kennett Square, he now beheld a dim twilight chaos, wherein more and more of the distance was blotted out. Yet still some spell held up the suspended rain, and the drops that fell seemed to be only the leakage of the airy cisterns before they burst. The fields on either hand were deserted. The cattle huddled behind the stacks or crouched disconsolately in fence-corners.
In addition to preventing leakage, this ring no doubt prevented an excess of oil working up the piston into the cylinder. As the cylinder fired with every revolution, the valve gear was of the simplest construction, a fixed cam lifting each valve as the cylinder came into position.
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