Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 142,891 pages of information and 228,796 images on early companies, their products and the people who designed and built them.
of Station Road, Merton Abbey, London, SW19. Telephone: Liberty 3406. Cables: Rototherm, London"
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Bi-metallic Dial Thermometers also Vapour Pressure and Mercury in Steel types for all industrial apparatus. Desk and Wall Thermometers for room and factory temperatures. (Olympia, Ground Floor, Stand No. D.1687) 
Note: British Rototherm is now based in Port Talbot, South Wales, and has its own website: