The Principles, Construction, and Application of Pumping Machinery: (steam and Water Pressure) with Practical Illustrations of Engines and Pumps Applied to Mining, Town Water Supply, Drainage of Lands, Etc.; Also Economy and Efficiency Trials of Pumping Machinery |
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The Principles, Construction, and Application of Pumping Machinery: (Steam ... Henry Davey No preview available - 2016 |
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actuated air vessel applied beam boiler pressure bore-holes bottom bucket lifts bucket pump cataract cent centrifugal pumps Chap coal Colliery compound Cornish engine compound engine condenser connected Corliss valves crank cut-off diameter discharge double-acting driving column duty efficiency ratio engines and pumps equilibrium exhaust valve expansion feed water fly-wheel foot valve gallons heater high-pressure cylinder hydraulic engines hydraulic pumps I.H.P. per hour indicator diagrams jackets load low-pressure cylinder means mechanical efficiency metres mines motion non-rotative engines Pelton wheel piston pit-work plunger pumps power cylinder pump rods pumping-engine reservoir revolutions per minute rising main rotative engines shaft shown in fig single-acting sinking lifts speed steam accumulator steam cylinder steam engine steam per I.H.P. steam pipe steam pump steam valve stroke strokes per minute surface surface condenser syphon tank tappet temperature trial underground valve gear velocity vertical water-pressure Waterworks weight wheel whilst دو
Popular passages
Page 2 - The labour of turning these two parts of the engine, viz., the regulator and watercock, and attending the fire, being no more than what a boy's strength can perform for a day together, and is as easily learned as their driving of a horse in a tub-gin; yet, after all, I would have men, and those, too, the most apprehensive, employed in working of the engine, supposing them more careful than boys.
Page 1 - ... within the vessel, so far is the vessel dry without, and so very hot as scarce to endure the least touch of the hand. But as far as the water is, the said vessel will be cold and wet where any water has fallen on it, which cold and moisture vanishes as fast as the steam in its descent takes...
Page 6 - It next occurred to me that the mouth of the cylinder being open, the air which entered to act on the piston would cool the cylinder, and condense some steam on again filling it...
Page 1 - ... from its elastic power, to condense, and become a vacuum or empty space), so that the vessel P is, by the external air, or what is vulgarly called suction, completely refilled, while vp is emptying.
Page 6 - The attention necessary to the avocations of business prevented me from then prosecuting the subject further, but in the winter of 1763-4, having occasion to repair a model of Newcomen's engine belonging to the Natural Philosophy class of the University of Glasgow, my mind was again directed to it. At that period my knowledge was derived principally from Desaguliers, and partly from Belidor.
Page 6 - Being struck with this remarkable fact, and not understanding the reason of it, I mentioned it to my friend Dr. Black, who then explained to me his doctrine of latent heat, which he had taught for some time before this period, (summer...
Page 6 - Watt describes the simple but decisive experiments by which he discovered the latent heat of steam. His means and leisure not then permitting an expensive or complex apparatus, he used apothecaries...
Page 266 - HP, or horse-power of the water raised divided by the indicated horse-power of the steam-engine,and does not therefore show the full efficiency of the pump, but that of the combined pump and engine. It is, however, a very simple way of showing the relative values of different kinds of pumping-engiues having their motive power forming a part of the plant.
Page 2 - I would have men, and those, too, the most apprehensive, employed in working the engine, supposing them more careful than boys." "In case it should be objected that the boiler must in some certain time be emptied, so as the work of the engine must stop to replenish the boiler, or endanger the burning out or melting the bottom of the boiler : to obviate this, when it is thought fit by the person tending the engine to replenish the great boiler, which requires an hour and a half or two hours...
Page 277 - ... pipes. A partial vacuum is created by the water at the ends of these small pipes, and hence atmospheric pressure drives the air into the water in innumerable small bubbles, which are carried by the water down the compressing pipe C. During their downward course with the water the bubbles are compressed, the final pressure being proportional to the column of return water sustained in the shaft E and tailrace F.