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 H.M. Hobson Ltd. regarding overnight loss on Telegage installations due to temperature drops and condensation.
| Identifier | ExFiles\Box 44\3\ Scan022 | |
| Date | 27th September 1928 | |
| x4038 CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, AIR MINISTRY AND TO THE DOMINION & FOREIGN GOVERNMENTS. PLEASE ADDRESS ALL COMMUNICATIONS TO THE FIRM, NOT TO INDIVIDUALS. TELEPHONE: CHISWICK 4231 (4 Lines). TELEGRAMS: "ASSEMBLAGE, LONDON". H.M. HOBSON, LTD. 47-55, ACTON VALE, LONDON, W.3. MANUFACTURERS OF Hobson K-S Petrol Telegage AND MOTOR ACCESSORIES. WORKS: LONDON AND WOLVERHAMPTON. OUR REF. TPS/AML YOUR REF. Hs{Lord Ernest Hives - Chair}/Rml/LG. 27th September, 1928. For the attention of Mr. Robotham. Messrs. Rolls-Royce Limited, Derby. Dear Sirs, We beg to thank you for yours of the 26th inst., and note the improved results which you are getting with the Telegage installations which you are running. We have no doubt that your assumption with regard to the lower day temperatures now being experienced has a considerable bearing on the matter. We think it rather goes to show that possibly half the over-night loss of 5% of the reading on the gauge is due to loss of volume owing to temperature drop, and the other half to [handwritten correction: Condensation] [crossed out: vaporisation]. Under any conditions, however, it is urgently necessary to keep the air pumping sufficiently vigorous to reduce this condensation loss to a minimum, at any rate within the limits of the capacity of the bell. [Stamp on left side] MOTOR EXHIBITION OCT 11-20 OLYMPIA OUR STAND No. 448 Gallery | ||