WINSLOW, John Flack, manufacturer, born in Bennington, Vermont, 5 November, 1810. He was educated at select schools of Albany, was a clerk in commercial houses in New York from 1827 till 1831, and in the latter year became agent of the New Jersey iron company. In 1833 he engaged in the production of pig-iron in Bergen and Sussex counties, New Jersey, and in 1837 he formed a connection with Erastus Coming, of Albany, which lasted under various firm-names for thirty years. The firm, controlling the Albany and Rensselaer ironworks, was one of the largest producers of railroad and other iron in the United States. During his visits to Europe, Mr. Winslow purchased the right to manufacture and sell Bessemer steel in this country. The United States government contracted with his firm for the construction of the " Monitor," which was begun in October, 1861, at Greenpoint, Long Island, was launched, 30 January, 1862, and delivered to the government, 5 March, 1862. In 1867 Mr. Winslow retired from active business. In 1863-'7 he was president of Rensselaer polytechnic institute. He has been president of the Poughkeepsie and Eastern railway, and of the company for constructing the Poughkeepsie bridge over Hudson river.