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).
Blueprint of a piston showing a side view with dimensional measurements.
| Identifier | ExFiles\Box 87\2\ scan0043 | |
| Date | 12th April 1935 guessed | |
| 3.240 3.247 -1/2 BEFORE SAWCUTTING 3.2475 -1/2 3.2475 -1/2 3.2475 -1/2 | ||