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F. Darton and Co of 142 St. John Street and 52 Clerkenwell Road, London, EC
Note: Not connected with Frank Darton, merchants, of Cornhill, London, trading under the style of F. Darton & Co
1834 Company established by Alfred Oborne.
1873 Mentioned. F. Darton and Co., of St. John-street Clerkenwell.
1880 Advertisement. 'BAROMETER MAKERS. DARTON, F. & CO., 45 St. John Street, also St. John’s Lane, West Smithfield, London, E.C., makers of all kinds of Barometers and Thermometers. Makers to the British, French and Japanese Governments.'
1904-06 Producing small gas and oil engines at 1/3rd hp. 
1914 Wholesale manufacturing opticians and scientific instrument makers. Specialities: standard meteorological instruments for observatories, recording meteorological instruments, spectacles and folders, opera, field and marine glasses, prism binoculars, microscopes and telescopes, meteorological instruments, barometers and thermometers, clinical etc., electro-medical apparatus, electrical accessories, model motors and dynamos etc. 
c1930s F. Darton and Co Ltd., of Yale Road, Bushey, Watford, Herts - makers of anemometers, barometers, barographs, hygrometers, hygrographs, rain gauges, recording rain gauges, record charts, recording ink nibs etc., school equipment, thermometers, thermometer screens, thermographs. 
Barometer Makers and Retailers 1660-1900 by Edwin Banfield, records the company as working from various addresses in London from 1834 onwards, and the company existed up until the 1990s