The use of the steam-engine indicator : or, Practical science for practical men by Lyman Edward

Author:Lyman, Edward
Language: eng
Format: epub, pdf
Tags: Indicators for steam-engines
Publisher: New Haven, Conn. : the author
Published: 1874-03-25T05:00:00+00:00

DIAGRAM NO. 8.

In this diagram there seems to be no admission line; but starting at 50 pounds pressure, which has been reached by compression, the pressure falls at once to 20 pounds at about T ou of the stroke. Then the piston of the Indicator recoils slightly, and falls again and crosses the compression Jine at about #0, and falls to about 2-J- pounds; then rises again to 4 pounds, at about ttht, and from there gradually falls until it crosses the atmospheric line at -^JV, and falls to a little more than 1 pound below the atmospheric line, to the point of exhaust at about -nfo, when the atmosphere comes in and raises the pressure to a little more than 1 pound above the atmosphere, which gradually falls until -ft of the return stroke is reached, when the compression begins and carries the pressure up to 50 pounds, the place of beginning. In fact when this card was taken the engine was run by the compression. In this stroke it seems not to have taken any live steam at all, which is a characteristic of this engine. When the speed is up, and the steam is not wanted, it shuts it all off; and when it takes steam, what is taken is right up to boiler pressure. The writer has seen this engine supersede an ordinary slide-valve engine, and save 75 per cent, of the fuel required by the old engine, which, after all, was not very old, having been run only about two and

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