THE date of the phrase “British thermal unit” can be pushed back by fifteen years ; it occurs in W. J. M. Rankine, “Manual of the Steam Engine” (1859), p. 300 ; but here, as in the 1875 quotation ...
A CERTAIN amount of interest appears to have arisen of late as to the history and definition of the British thermal unit. The position so far as we have been able to ascertain it is set out below, and ...
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