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 the calibration of a petrol telegage for a 20 HP gauge.
| Identifier | ExFiles\Box 44\3\ Scan097 | |
| Date | 5th December 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/MW YOUR REF. Hs{Lord Ernest Hives - Chair}/Em3/LG. ENCLO. Reports. 5th December 1928. For the attention of W.A. Robotham, Esq.. Messrs.Rolls-Royce,Ltd., Expl. Dept. Derby. Dear Sirs, We beg to thank you for your letter of the 30th ult., enclosing report on 20 h.p. gauge to F.55744 (K.S.155). CALIBRATION. We note that this gauge is reading one-third of a gallon low all the way up the scale on a fill up. We think that possibly this is accounted for by two things; the angle at which the bell is tilted in this installation, and also by the combination of manufacturing variations, both in the case of the tank flange and our own unit. We are accordingly making a new tank unit for this installation, which will bring the bottom bell | ||