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 Ferodo Limited regarding the maximum coefficient of friction in the presence of grease.
| Identifier | ExFiles\Box 141\3\ scan0208 | |
| Date | 1st September 1933 guessed | |
| From FERODO LIMITED. Sheet No. 2 Messrs. Rolls Royce Ltd., DERBY. We have not yet run an actual test but in our opinion the maximum, while any grease was present, would be no higher than μ=0.15. Yours faithfully, FERODO LIMITED. [Signature] CHIEF ENGINEER | ||