Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 108
zontalmovement of the paper, a closed figure is drawn called the indicatordiagram. The enclosed area represents the effective work done bythe steam upon the piston ; the upper portion of the diagram representsthe varying pressure of the steam during the forward or impulse THE INDICATOR. 91 stroke… … Fig. 9G. but the actual diagram is usually ■ the more satisfactor}-, as itapproaches the more closely to the form of the theoretical diagram. Three indicators will be here described, as sufficient for ourpurpose, namely, the Thompson indicator, the Tabor indicator, andthe outside-spring indicator…
Steam-engines
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