Clarkson Thimble Tube Boiler Co
of 613 Australia House, London, WC2. Telephone: Temple Bar 2122/3. Telegraphic Address: "Clarsteamo, 'Phone, London"
1937 Advert in British Industries Fair Catalogue. One of two Clarkson Patent thimble Tube Silencer Boilers for new L.M.S. 3-car articulated Diesel Train, similar to Boilers used by G.W. Railway, Netherlands, Danish, Spanish, Canadian and Irish Railways. (Engineering/Metals/Quarry, Roads and Mining/Transport Section - Stand Nos. D.501 and D.400)
1944 Patent - Improvements in steam generators or water heaters.
1951 Patent - Improvements in thimble tube boilers.