In existographies, H.H. (c.1777-c.1850) (CR:3) was an anonymous Scottish engineer, noted for []

In 1822, H.H., in his “Account of a Steam-Engine Indicator”, presented to the world the first published account of James Watt’s 1796 steam engine indicator and indicator diagram, based on based on details of the device given by a “Mr. Field”, the following are his illustrations: [1]

Indicator (1822)

H.H. also gave an example of the PV diagram or indicator diagram that the device made, shown below:

Indicator diagram (1822) 2


It may have been possible that H.H.’s “Account of a Steam-Engine Indicator” is from where Emile Clapeyron (1834) learned of the indicator diagram method.

Quotes | By
The following are quotes by H.H.:

“It is only upon the unbiased results exhibited to our actual observation through the medium of inanimate matter, acting on known principles, that implicit confidence ought to be placed.”
— H.H. (1822), “Account of a Steam-Engine Indicator”; cited by: Davis Baird (2004) in Thing Knowledge: a Philosophy of Scientific Instruments (pg. 189) [2]

1. (a) H.H. (1822). “Account of a Steam-Engine Indicator”, Letter to the Editor of Quarterly Journal of Science, Literature and the Arts, 13:91-95. in: The Repertory of Arts and Manufactures (pgs. 14-19). Publisher, 1822.
(b) Cardwell, Donald S.L. (1971). From Watt to Clausius: the Rise of Thermodynamics in the Early Industrial Age (pg. 80). Cornell University Press.
2. Baird, Davis. (2004). Thing Knowledge: a Philosophy of Scientific Instruments (pg. 189). University of California Press.

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