Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 133,737 pages of information and 211,889 images on early companies, their products and the people who designed and built them.
of 414 Montrose Avenue, Trading Estate, Slough, Bucks, (now Berks). Telephone: Slough 20247-8. Maker of optical measuring instruments; optical systems, lenses, prisms, etc.; cine sound units; studio moving picture cameras.
1940 Business established.
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Optical Measuring Tools, rotary and inclinable Tables, Vertical and Horizontal Omtimeters, Toolmakers' Microscopes, Tool Setting and Thread Form Microscopes, Works Projectors, General Optical Systems, lenses and prisms, Precision Boring Heads. (Olympia, Ground Floor, Stand No. A.1107) 
1968 Queen's Award to Industry for Export Achievement and for Technological Innovation. 
1968 Established new factory at Helston, Cornwall
1973 Factory at Helston closed; most of the 140 staff were made redundant.
Now Rotary Precision Instruments UK Ltd, located in Bath