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).
Suggestion to make valve washers lighter and tapered as per a sketch.
| Identifier | ExFiles\Box 80\3\ scan0117 | |
| Date | 18th March 1912 guessed | |
| (5) Valve washers should be made lighter, could not same be tapered as per sketch ? F.H.R. | ||