Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 564
e pressure vary, the piston will have corresponding movements either up or down. If a pencilp, be attached to the piston-rod, it will register the variations of pressure upon a piece of paper heldagainst it; but, unless some provision were made to give a clear space upon the paper at each instantof… … piston, and a reversed motion during the return stroke, while the pencil moves vertically, a continuousline will be traced upon the paper, which will inclose a space, and the vertical ordinates of the figurewill represent the effective pressure during a complete stroke. Instead, however, of using a…
Mechanical engineering
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