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. explaining the function of a safety vent pipe on their K-S Telegages.
| Identifier | ExFiles\Box 44\2\ Scan085 | |
| Date | 8th November 1927 | |
| X4038 CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, AIR MINISTRY AND TO THE DOMINION & FOREIGN GOVERNMENTS. PLEASE ADDRESS ALL COMMUNICATION TO THE FIRM, NOT TO INDIVIDUALS. TELEPHONE: CHISWICK 4231 (4 LINES). TELEPHONE: VICTORIA 1070 (2 LINES) TELEGRAMS: "ASSEMBLAGE, LONDON." H.M. HOBSON, LTD. 29 & 31 VAUXHALL BRIDGE ROAD, LONDON S.W.1. 47-55, ACTON VALE, LONDON, W.3. 8th. November, 1927. MANUFACTURERS OF:- Hobson K-S Petrol Telegage AND MOTOR ACCESSORIES. WORKS: LONDON AND WOLVERHAMPTON. OUR REF. TPS/MAB. YOUR REF. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}8/LG. ENCLO. 1. For the attention of Mr. W.A. Robotham. Messrs. Rolls-Royce, Ltd., Derby. Dear Sirs, We beg to thank you for yours of the 7th November, with reference to the vent pipe on Hobson K-S Telegages. We fully appreciate that your tanks are efficiently ventilated to atmosphere, but our vent pipe is in the nature of a safety device on our gauge, and prevents the liquid being blown out of the dash board instrument, under practically all conditions. The vent pipe communicates directly with the upper chamber of the bottom bell. We are enclosing our diagram sheet, which shows exactly its position. This upper chamber communicates (1) with the gauge via the air tube and air line; (2) with the petrol tank via the small holes B and C. It is possible to put an abnormally high pressure | ||