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 regarding an instrument's performance at different air temperatures and its installation.
| Identifier | ExFiles\Box 123\1\ scan0129 | |
| Date | 24th October 1938 | |
| 105 1038 WE ARE EXHIBITING AT BICYCLE AND MOTOR CYCLE SHOW NOV 7-12 EARLS COURT STAND No. 133 CONTRACTORS TO ADMIRALTY, WAR OFFICE & AIR MINISTRY BY APPOINTMENT TO HIS MAJESTY THE KING CABLES: SPEEDOFAC, LONDON. CODES: MARCONI, COMMERCIAL, BENTLEY'S. ENGINEERING AND ALLIED EMPLOYERS' NATIONAL FEDERATION TELEPHONE TELEGRAMS BRANCHES AT PARIS MILAN SYDNEY WELLINGTON AGENCIES AND SERVICE STATIONS THROUGHOUT THE BRITISH EMPIRE AND IN ALL THE PRINCIPAL COUNTRIES S. Smith & Sons (Motor Accessories) Ltd CRICKLEWOOD WORKS LONDON N.W.2 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 Dde 1038 Please quote our reference: S.10 Your Ref: RM{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}17/JH 24th October, 1938. Messrs. Rolls-Royce Ltd., DERBY. Dear Sirs, For the attention of Mr. C.T. Salt Further to your letter of the 7th September and our acknowledgment of the 9th, we much regret the delay in replying to you, but we considered it advisable to get in touch with the original inventor of this device, who has not been available until recently, and we would say that you certainly seem to be working at very low temperatures if you are down to 20°C. Our own opinion is that you would do better at a higher temperature. We note that your normal under bonnet temperature is 40-45°C., but that you suggest you would like to take the supply of air from outside the bonnet, which seems to indicate that under certain conditions your temperature is considerably higher. From tests which we made prior to sending you the unit we formed the opinion that if we collect cold air from the outside through normal pipework, there is a risk of interfering with the free flow of air, and therefore, whatever design is decided upon to collect air from the outside, it must be such that it does not interfere with the free flow. Incidentally, we are of the opinion that you will need two instruments for a 4 1/4-litre engine and we shall be pleased to send you an additional unit if you wish. Once again we should like to point out that we are a little in the dark ourselves in regard to the effectiveness of this contd. To avoid delay all envelopes should be addressed to the firm. | ||