 Whitin died in 1831.Years later, with the cotton business on a solid basis and escalating in 1845, Betsey Whitin and her sons built a new, stone textile factory, largely of granite known as the Whitinsville Cotton Mill, which gave the family business 7,500 more spindles.The Whitinsville Cotton Mill would later be used as a testing facility for new equipment developed by the Whitin Machine Works, across the street.