Photograph of an O.S. Speedometer Co. fuel gauge measuring in gallons, with its sensor unit.
| Identifier | ExFiles\Box 75\2\ scan0166 | |
| Date | 17th September 1926 guessed | |
| PATENTED O S. 0 5 10 15 20 O.S. SPEEDOMETER CO LD 3, GALFRED PLACE, LONDON. W.C.1 Gallons | ||
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).