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Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
ufacture, and in 1749 the first European morocco manufactory was established at St. Hippolyte, in Alsace; the art was not fairly developed in France before 1797. This manufacture was subsequently introduced into England and Germany. In 1761, McBride of Dublin, and, in 1770, Johnson, introduced the use of dilute sulphuric acid for swelling the hides. Sumac was used in the first half of the eighteenth century, divi-divi, from Caraccas in 1768. Catechu at a much later period. Steam-heating vats seem to have originated in America, but formed the subject of a French patent of 1822. The quick process was proposed by McBride in 1759, but he extracted the tanning material with lime-water. It was not until 1793-95 that the active principle requisite to the success of the process — tannic acid — was recognized by Deyeux and Seguin of Paris. It was rendered practical by Fay in England, 1790, and Seguin in France, 1795, and improved by Desmond, Brewin, Cant, and Miller. In 1839 the