Safety Valve, Hackworth's multi-leaf spring type, small, 1818-1838. Multi-leaf spring safety valve 1818-1838
Papers, Further Papers of Timothy Hackworth & Family, 1820s-1850s. Includes letters 1820s-1850s, miscellaneous drawings, papers re Soho Works from 1845 to sale in 1856, printed patent documents of Hackworth and his sons, ledger, newspaper articles and clippings. Also copy of dissertation on Hackworth by Robert Young. Further Papers of Timothy Hackworth & Family 1820-1859