From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from S. Smith & Sons about complaints over the incorrect filling of Calorstats and the resulting specification changes.
| Identifier | ExFiles\Box 156\2\ scan0212 | |
| Date | 15th March 1939 | |
| 105 1328 F.J. HARDY CONTRACTORS TO ADMIRALTY, WAR OFFICE & AIR MINISTRY S. SMITH & SONS (Motor Accessories) Ltd CRICKLEWOOD WORKS LONDON, N.W.2 TELEPHONE: GLADSTONE 3333 (20 LINES) TELEGRAMS: SPEEDOFAC, PHONE, LONDON. CABLES: SPEEDOFAC, LONDON. CODES: MARCONI, COMMERCIAL, BENTLEY'S. BY APPOINTMENT TO HIS MAJESTY THE KING BRANCHES AT PARIS MILAN SYDNEY WELLINGTON AGENCIES AND SERVICE STATIONS THROUGHOUT THE BRITISH EMPIRE AND IN ALL THE PRINCIPAL COUNTRIES SHOWROOMS & DEPOTS 179-185 GT PORTLAND ST LONDON, W.1. 26-33, COX ST LIVERY ST BIRMINGHAM. 14a JACKSONS ROW DEANSGATE MANCHESTER 21, DRURY STREET GLASGOW DUBLIN & BELFAST Please quote our reference: E.6 FGE/MM. March 15th, 1939. Messrs. Rolls Royce Ltd., DERBY. for the attention of Mr.W.A.Robotham. Dear Sirs, CALORSTATS With reference to your complaint about the incorrect filling of Calorstats, there has been quite a bit of correspondence on the subject since, particularly in October of last year, one letter dated 6th Oct. Ref:- Rm{William Robotham - Chief Engineer}/Std.4/JH. and our reply thereto puts the thing in a nutshell. You will see that complaints arose about the operation of these units using the previous filling and that it became necessary to interpret the instruction on your drawing regarding the performance, since then we have taken the instruction to mean that at 75 degrees cent. the bellows unit must have travelled .425" and that at 90 degrees the bellows should support a load of 27½ lbs. plus or minus 2 lbs. The Hexane filling we now use fulfils the specification much more regularly than the previous mixed filling, but since your running temperature is lower it is evident that the specification required modification. We regret that this has given you trouble and we will take steps to immediately rectify the 50 you are returning. In this connection it would seem that the specification should read "commences to open at 75 degrees under no load and supports 27½ lbs. plus and minus 2 lbs. at commencement of stroke". The travel of .425" will be given at some temperature between these. | ||