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James A. Sinclair and Co, photographic and scientific instrument makers, of 54 Haymarket, London. (1922)
of 9-10 Charing Cross, London, SW1. Telephone: Regent 6288. Cables: "Oraculum, London."
1904 James A. Sinclair was awarded a prize at the Louisiana Purchase Exhibition.
1909 Arthur Newman set up a new partnership with James A. Sinclair called Newman and Sinclair, and opened a workshop to manufacture film equipment that would be retailed by James A. Sinclair and Co, the best known being Newman and Sinclair's Una
Newman designed the Newman-Sinclair reflex camera, a lightweight design carrying 400 feet of negative in film boxes placed side by side.
1910 Herbert Ponting took one of the cameras on Captain Scott's ill-fated polar journey.
1922 Listed Exhibitor - British Industries Fair. Manufacturers of Newman and Sinclair N. S. Cameras, Iris Dissolvers, Tripods with Revolving and Tilting Tops, Film Perforators and Appliances for Kinematograph work. (Stand No G.61e) 
1929 Listed Exhibitor - British Industries Fair. Manufacturers of Photographic and Kinematographic Cameras, including the Sinclair "Una" in Standard and Tropical Models; the "N. S." Standard Kine' Camera with electric drive, and "N. S." Auto Kine' Camera taking 200ft. (35mm.) film. (Stand No. O.4) 
Newman and Sinclair continued on well into the 1950's, mainly focusing on Cine equipment.