Excerpt from Manual of the Steam-Engine Indicator

The steam-engine indicator is an instrument in vented by Watt to measure and record the pressure Of the steam in the cylinder Of an engine. The dia grams drawn by an indicator enable us to calculate the power Of the engine, to examine and adjust the actions Of the engine va'ves, and to make certain in ferences concerning the transformation of heat into work and the in¿uence Of the metal Of the cylinder on that Operation. Too much emphasis cannot be given to the fact that the sole Office Of the indicator is to measure and record pressure, actions which are commonly said to be revealed by the indicator are really inferences based on the pressure or on changes Of pressure.

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