Letter | Published:

History of the British Thermal Unit

Nature volume 149, page 613 (30 May 1942) | Download Citation

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Abstract

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 given by Dr. Powell1, it is a descriptive phrase and not a technical term ; Rankine is in fact contrasting the British thermal unit and the French thermal unit.

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References

  1. 1.

    NATURE, May 9, p. 525.

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  1. The Library, Queen's University, Belfast. May 13.

    • G. WOLEDGE

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DOI

https://doi.org/10.1038/149613c0

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