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Isaac Hill (c1829-1904) Senior Partner in Isaac Hill and Son.
1861 Living at 103 Booker Street, Derby: Isaac Hill (age 32 born Derby), Iron (?). With his wife Maria Hill (age 32 born Derby) and their two children Joseph Hill (age 8 born Derby) and Rebecca Hill (age 7 born Derby).
1904 Died with his wife. 'Mrs. Hill, whose husband was found dead in a bedroom in a Brighton boarding house Saturday, and who herself was unconscious, through an escape of gas, died to-day. At the inquest to-day on Mr. Isaac Hill, a retired tradesman of Derby, an open verdict returned.'
1904 Obituary 
WE regret that we have to announce the accidental death, under most tragic circumstances, of Mr. Isaac Hill and his wife, who were both asphyxiated, while spending a holiday at Brighton.
Mr. Hill was a well-known engineer. He was senior partner in the firm of Isaac Hill and Son, St. George's Works, Derby, and was the original patentee and introducer of the system of cold sawing iron and steel. Nearly forty years ago cold band saws on this system were used in Woolwich gun factories for cutting out the cheek-plates of gun carriages. He established a fine reputation for the manufacture of large malleable castings, and all kinds of machines (or sawing iron and steel, bot and cold.
We may add that Mr. Hill had retired from business, and that his son, Mr. Joseph Hill1 has for the last eight years been sole proprietor of the Derby works.