William Sellers, American mechanical engineer and manufacturer, c 1890s.
© Science Museum / Science & Society Picture Library
William Sellers (1824-1905)'s company built machine tools for which Sellers held over 90 patents. These patents included the design for standardized screw threads which were endorsed by the US government and later adopted as an international standard. Sellers was also instrumental in the development of the Centennial Exhibition in Philadelphia, an event that Sellers pasionately believed should represent the best in American design.