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 two front leaf springs after undergoing a Brinell hardness test.
| Identifier | ExFiles\Box 87\4\ scan0029 | |
| Date | 23th May 1934 guessed | |
| B.29 AE. FRONT SPRINGS. BRINELL TESTED. 308 320 | ||