Steam Engines, Elevators

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International Textbook Company, 1902 - 640 páginas
 

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Página 37 - 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 28 - This pump forces the water up through the valves and water inlet to the condenser. It flows, as indicated by the arrows, through the inner tubes of the lower section, then back through the space between the inner and outer tubes.
Página 10 - ... pounds per square inch, and if the area of the piston is 100 square inches and the absolute pressure of the steam 100 pounds per square inch, the net pressure on the piston in Fig.
Página 33 - 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 32 - 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...
Página 36 - This filling consists of layers of cylindrical tubular tiling c, c', c", which rest upon a grating d supported by a brick wall e 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...
Página 36 - ... 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 too great strains on the engine. Automatic cut-off, high-speed...
Página 38 - 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 L, opening the auxiliary...
Página 1 - 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...

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