A Treatise On Waterworks for the Supply of Cities And Towns With a Description
A Treatise On Waterworks for the Supply of Cities And Towns With a Description
Samuel Hughes
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Of coal per horse power per hour, which is equivalent to a duty of more than 44 millions. Considerable allowances, however, must be made from this large amount of duty, as it is almost certain that the whole working power of the engines is estimated, and no distinction made between the power absorbed in overcoming friction and that producing useful effect. It is certain that the recorded performance of those engines does not represent the actual duty, as we have no instance of high pres- sure e...ngines anywhere, and, under any circumstances, working with a duty much exceeding twenty million pounds = 11 Ibs. Of coal per horse power per hour. CONDENSING HIGH-PRESSURE ENGINES WORKING EXPANSIVELY. Most of these engines are single acting, like the condensing Boulton and Watt pumping engines, the principal distinction being that they work with steam of much higher pressure ; that this steam is cut off after performing from one-eighth to one- third of the stroke, and that the cylinder, boiler, and steam pipes are very carefully clothed with non-conducting material to pre- vent any loss of heat by radiation.
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