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The Origin of the British Thermal Unit


Thomas Tredgold
July 21, 2009
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Here are a few pages from Thomas Tredgold's 1824 book, The Principles of Warming and Ventilating Public Buildings, etc. This is the first text ever written about heating and ventilating. In it, Mr. Tredgold writes about a new way of measuring heat, which evolved into what we today call the British thermal unit.