 This wood-framed spinning mill, two and one-half stories high had 200 spindles and was only the third cotton mill in the Blackstone Valley at the time.In 1815, Whitin became a partner with Colonel Fletcher, Betsey's father, and his two brothers-in-law, Samuel and Ezra Fletcher, under the firm name of Whitin and Fletcher.Then they built a second mill with 300 spindles on the opposite side of the Mumford River.