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indicator diagram

British  

noun

  1. a graphical or other representation of the cyclic variations of pressure and volume within the cylinder of a reciprocating engine obtained by using an indicator

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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In this case an approximation may be made from an indicator diagram which represents the average operation of the engine during the test.

From Steam Engines Machinery's Reference Series, Number 70 by Anonymous

The method of the indicator diagram has since proved of great utility in physics in studying the properties of gases and vapours.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" by Various

The theoretical indicator diagram is made up of two isothermal lines for the taking in and rejection of heat, and two lines of constant volume for the two passages through the regenerator.

From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg

The amount of water evaporated in the boiler is not accounted for by an indicator diagram or card, and the full reasons for this are not known.

From Modern Machine-Shop Practice, Volumes I and II by Joshua Rose

Q.--Will you give an example of an indicator diagram?

From A Catechism of the Steam Engine by John Bourne, C.E.

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