A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 537
der. The pressure of the steam urges theindicator piston upwards against the resistance of a spring U. Theheight through which the piston rises is thus proportional to thepressure. The movement of the piston is small, and is magnified by-means of a parallel-motion mechanism G, to which the end of… … ^E4 FIG. 469.—Arrangement for driving the indicator drum. crosshead and is brought back again by means of a spring A. Apencil attached to the left-hand end of G draws the diagram on thepaper. Vertical heights on the paper represent pressures, andhorizontal distances represent the movements of the…
Physics
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