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).
Photograph of twelve engine tappets arranged in two columns.
| Identifier | ExFiles\Box 97\4\ scan0223 | |
| Date | 24th November 1938 guessed | |
| TAPPETS. | ||