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John Cail (c1809-1878) was working at various addresses in Newcastle upon Tyne from 1825-65.
1844 John Cail, Mathematical and Philosophical Instrument Maker and Optician, 61 Pilgrim Street and 45 Quayside, Newcastle.
1853 Patent. '262. And Robert Mortimer Glover, of Newcastle-on-Tyne, Doctor of Medicine, and John Cail, of the same place, Mathematical Instrument Maker, have given the like notice in respect of the invention of "improvements in miners' or safety lamps."'
1855-65 at 21 Grey Street