HENRY, WILLIAM. 1774-1836.


"Experiments on the Quantity of Gases Absorbed by Water at Different Temperatures and under Different Pressures." [Offprint from:] Philosophical Transactions of the Royal Society of London, vol 93. London: Printed by W. Bulmer and Co., 1803. FIRST APPEARANCE OF HENRY'S LAW. The rare offprint in which Henry first describes his discovery of the proportional relationship between a gas absorbed in a liquid and the pressure of the gas over the liquid, now known as Henry's Law. Significant in itself, Henry's discovery was also crucial to the development of his contemporary John Dalton's atomic theory. See "The Origin of Dalton's Chemical Atomic Theory," Isis, 1956. With Henry's clipped signature mounted on a slip of paper and laid-in.