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  • U.S.
    Sunday Dec 3, 1911

    Willis Carrier

    Rational Psychrometric Formulae

    U.S.
    Sunday Dec 3, 1911

    On December 3, 1911, Carrier presented what is perhaps the most significant document ever prepared on air conditioning – Rational Psychrometric Formulae – at the annual meeting of the American Society of Mechanical Engineers. It became known as the "Magna Carta of Psychrometrics".




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