. Elements of technology :. below, and the pressure of theair is communicated, by an ascending tube, D,to a third cavity. A, containing the water whichsupplies the jet. In this form of the machine, thewater will continue to spout from the pipe E,until all the water in the reservoir C, has de-scended into the vessel B. The principle ofHeros fountain has been applied to raise oilin lamps, and one of its most simple forms has already beendescribed under the head of hydrostatic lamp, page 179. Atmospheric Machines.—The spontaneous vicissitudes ofthe pressure of the air, occasioned by changes in th
. Elements of technology :. below, and the pressure of theair is communicated, by an ascending tube, D,to a third cavity. A, containing the water whichsupplies the jet. In this form of the machine, thewater will continue to spout from the pipe E,until all the water in the reservoir C, has de-scended into the vessel B. The principle ofHeros fountain has been applied to raise oilin lamps, and one of its most simple forms has already beendescribed under the head of hydrostatic lamp, page 179. Atmospheric Machines.—The spontaneous vicissitudes ofthe pressure of the air, occasioned by changes in the weightand temperature of the atmosphere, have been applied bymeans of a series of reservoirs, furnished with proper valves,to the purpose of raising water by degrees to a moderate it seldom happens that such changes are capable of pro-ducing an elevation in the water of each reservoir of more thana few inches, or at most a foot or two, in a day; and the wholequantity raised, must therefore be ARTS OF CONVEYING WATER. 323 Hydraulic Ram.—The momentum of a stream of water,flowing through along pipe, has also been employed for raisinga small quantity of water to a considerable height. The pas-sage of the pipe being stopped by a valve, which is raised bythe stream, as soon as its motion becomes sufficiently rapid,the whole column of fluid must necessarily concentrate its ac-tion almost instantaneously on the valve. In this mannerit loses the characteristic property of hydraulic pressure, andacts as if it were a single solid; so that, supposing the pipe tobe perfectly elastic, and inextensible, the impulse may over-come any pressure however great, that might be opposed to the valve opens into a pipe leading to an air vessel, acertain quantity of the water will be forced in, so as to con-dense the air, more or less rapidly, to the degree that may berequired for r^iising a portion of the water contained in it, to agiven height. JMr Whitehurst app
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