Articoli correlati a The mechanical Euclid, containing the elements of mechanics...
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1837 Excerpt: ...of water HP; also the weight of the fluid in AC urges the water in the same direction, with a force equal to a column PQ (Prop. 8); therefore the obstacle at C sustains a pressure downwards equal to a column HP + PQ or HQ. But the pressure on C upwards is equal to the column of the water-barometer HM: therefore the remaining pressure downwards at C is equal to the remaining column MQ. And if there be no obstacle at C, the fluid in the siphon BAC will be urged in the direction BAC by a force equal to a column of fluid MQ. But if the vertical height of MA be greater than that of the water-barometer, there will be a vacuum formed above the fluid at A (Prop. 28, Cor. l), and the siphon will not act. Also, if instead of water and the water-barometer, we had taken any other fluid and the corresponding barometer, the reasoning, and the result, would have been the same as above. Prop. XXX. To describe the construction of the common pump, and its operation. A valve is an appendage to an orifice closing it and opening in such a manner as to allow fluid to pass through the orifice in one direction and not in the opposite one. A piston is a plug capable of sliding in an orifice or tube so as to produce or remove fluid pressure. The Common Pump consists of a cylindrical barrel AB, closed at bottom with an upwards-opening valve B, and of a piston D with an upwards-opening valve, which moves up and down in the barrel. A suction-pipe BC passes downwards from the valve B to the well at C, and the water which rises above the piston is delivered by the spout E. The operation of the pump is as follows. The piston D being in its lowest position, is raised to its highest position by means of the lever HKL. Since the valve D opens upwards, no air is admitted at D during this rise...
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