Jonathan Salt (1759-1815) was born at Wardsend, the son of Daniel (a carpenter or farmer).  He was apprenticed to his brother, John, who was a table knife manufacturer at Hollis Croft.  Jonathan became a Freeman in 1791.  He joined his brother as a partner in J. & J. Salt, 61 Hollis Croft.  Their trademark was a complicated arrangement, which included a diamond and horizonatal letters ‘H’ and ‘T’.  John apparently died in 1808.  Jonathan continued the business until his death on 2 August 1815 (the brothers were buried at St Peter & St Paul).  Jonathan was recalled as unambitious, but achieved renown as an amateur botanist, which led to election to the Linnean Society (Sheffield Independent, 3 June 1875).   A short biography of him was published in R. E. Leader, Reminiscences of Old Sheffield (1876).