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).
Comparison of oil consumption and 'blow by' on Hepworth and Grandage rings.
| Identifier | ExFiles\Box 155\2\ scan0326 | |
| Date | 25th May 1939 | |
| -4- Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/JH.25.5.39. comparison with oil consumption and 'blow by' on Hepworth and Grandage rings. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Swdl{Len H. Swindell} | ||