International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades, Or for Those who Desire Information Concerning Them, Volumen8

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International Textbook Company, 1902
 

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Página 33 - Two bodies cannot occupy the same space at the same time. The sovereignty of the Church and that of the United States cannot both exist.
Página 32 - ... connecting-rod and because it is also necessary to allow for the formation of water in the cylinder due to the condensation of steam, particularly when starting the engine. As water is practically incompressible, some part of the engine would be broken when the piston reached the end of its stroke, provided there were no clearance space to receive the water ; usually the cylinder heads would be blown off. Neither is it practicable to compress to boiler pressure, as a general rule, for that causes...
Página 35 - Divide the continued product of the mean effective pressure in pounds per square inch, the length of the stroke in feet, the area of the piston in square inches, and the number of strokes per minute, by 33,000 ; the result will be the horsepower.
Página 29 - To find the piston speed of an engine, multiply the stroke in inches by the number of revolutions per minute and divide the product by 6. EXAMPLE. — An engine with a 52-inch stroke runs at a speed of 66 revolutions per minute.
Página 28 - Let IHP = indicated horsepower of engine; P — MEP in pounds per square inch; A — area of piston in square inches; L = length of stroke in feet ; N= number of working strokes per minute. Then, the above rule may be expressed thus...
Página 32 - Regulator. — Fig. 20 shows a regulating device much used in elevator work. Referring to the illustration, the operation is as follows: Steam from the boiler enters the regulator at the point marked "inlet" and passes through into the pump, which continues in motion until the required water pressure is obtained in the system, which acts through a ^-inch pipe connected at a and upon the diaphragm D. This diaphragm is raised by the excess water pressure and carries with it the weighted lever...
Página 14 - A stiffer spring is required on a fast-running engine than on a slow-running engine when the steam pressure is the same. See that there is no backlash between the piston and spring. Adjust the length of the cord so that the drum turns backwards and forwards without striking either of the stops at the end of the travel. When it touches one or the other of the stops, the cord is either too short or too long. If it touches both, the travel of the drum is too great, and the cord must be fastened to a...
Página 42 - ... valve for the car to go up. Also open the valve in the drain pipe from the side of the cylinder, and from the lower head of the cylinder, thus allowing the water to drain out of the cylinder. When the cylinder is empty, throw the valve for the car to descend in order to drain the...
Página 45 - HISTORICAL. 1. In 1781 Jonathan Hornblower constructed and patented an engine, similar to the present "compound," that had two cylinders of different sizes. Steam was first admitted into the smaller cylinder and then passed over into the larger, doing work on a piston in each. In Hornblower's engine the two cylinders were placed side by side, and both pistons acted on the same end of a beam overhead. The use of this early compound engine was abandoned on account of the suit brought by a Birmingham...
Página 32 - ... extending around the circumference of the tower. The warm discharge water from the condenser enters the tower through the pipe/, passes up the central pipe g, and is delivered on the upper layer of tiling and over the whole cross-section of the tower by the distributing device h, which consists of four pipes, radiating from the central pipe g, which are caused to revolve about the central pipe by the reaction of jets of water issuing from perforations on one side of each pipe. The water thus...

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