Photograph of a multi-cylinder engine crankcase with the main bearing caps installed.
| Identifier | ExFiles\Box 132\3\ scan0022 | |
| Date | 15th May 1934 guessed | |
| R-1 R-2 R-3 R-4 R-5 | ||
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).