Stiles & Baldwin (fl. 1791), Northampton, Mass.
Stiles & Storrs (fl. 1792), Northampton, Mass.
Thacher, Charles, probably Boston.
Thaxter, Samuel (1769-1842), Boston; also made nautical and mathematical instruments.
Wall, George Jr. (fl. 1788), Bucks County, Pa.
Warren, Benjamin (fl. 1740-1790), Plymouth, Mass.; also made nautical instruments.
White, Peregrine (1747-1834), Woodstock, Conn.; also made clocks.
Whitney, Thomas (fl. 1798-1821), Philadelphia; also made mathematical and optical instruments.
Williams, William (1737/38-1792), Boston; also made nautical instruments.