John Mather (1780-1858) built a powder mill at Manchester, Conn. in 1808. which operated for over 20 years. A man of many talents, he was a merchant, a glass blower, a manufacturer of gun powder and cotton cloth, and a farmer. He also wrote a genealogy of the Mather family in 1848.
This picture of his business card was sent by Erik Quist, a descendant. Thanks, Erik!