Steam engine indicator

Steam engine indicator

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Credit: MARK SYKES/SCIENCE PHOTO LIBRARY

Caption: Steam engine indicator in its box. This portable instrument was used to measure the cylinder pressure and piston movement in a steam engine. This information could be used to calculate horsepower ratings as well as to diagnose mechanical problems. This indicator was manufactured by The Crosby Steam Gauge and Valve Company.

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Keywords: 19th century, box, boxed, cut out, cut-out, cutout, cylinder, cylinders, device, diagnostic, early, engineering, equipment, historical, history, history of science, horsepower, instrument, mechanical, piston, pressure, steam engine, steam engine indicator, technological, technology, valve, valves

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