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).
The optimal gearbox oil height from a 10,000-mile test and instructing dipsticks to be marked.
| Identifier | ExFiles\Box 15\5\ Scan085 | |
| Date | 25th May 1939 | |
| X 7310. To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/GEH. c.c. to Wor.{Arthur Wormald - General Works Manager} Mx.{John H Maddocks - Chief Proving Officer} c.c. to RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/GEH/LG25.5.39. 'SS{S. Smith}' GEARBOX. We found during the 10,000 miles test that the height of oil in the gearbox which gave the most satisfactory results was 7" on the dip stick from the top. Will BY please instruct dip sticks to be marked. Hs.{Lord Ernest Hives - Chair} GEH. | ||