Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,180 pages of information and 233,419 images on early companies, their products and the people who designed and built them.
of Bassingbourn Iron Works, Royston
of Letchworth, and of 110 Cannon Street, London.
1903 Began the building of the Rational engine at Bassingbourn in 1.5, 3 and 6 hp sizes 
1904/5 Moved to Letchworth and built the first factory at Letchworth, called Gresham Iron Works. Manufactured railway materials, especially the component parts of the continuous automatic vacuum brake, and industrial oil-engines.
An associate of Gresham and Craven of Manchester
1904 July. Details of the Rational car.
1931 Exhibited their 'National' oil engines, vacuum brake exhausters and flood lighting equipment
1930s Ceased trading