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Thomas and William Henry, manufacturing chemists, of Manchester.
In addition to being manufacturers, Thomas Henry and his son William were prominent scientists in Manchester, and both became Fellows of the Royal Society.
Thomas Henry was one of the founding members of the Manchester Literary and Philosophical Society and later its president. He was in business as a surgeon-apothecary in King Street. He discovered a new way of making magnesium carbonate which he used as an antacid, and it became known as Henry's Magnesia. He was encouraged to manufacture the medicine, and it was produced in East Street.
Thomas Henry's son, William was born in Manchester on 12 December 1774, and died on 2 September 1836. He became a prominent scientist, specialising in chemistry, and established Henry's Law, which states that at constant temperature, the mass of gas dissolved in a liquid at equilibrium is proportional to the partial pressure of the gas. His book Experimental Chemistry (1799) was very popular in its day, going through eleven editions in 30 years
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