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 a Bumper for 3 inch Cams showing various thickness measurements after testing.
| Identifier | ExFiles\Box 95\3\ scan0207 | |
| Date | 3rd December 1935 | |
| G.81431 BUMPER - 3" Cams. 40 Hours. 40 mins. 3. 12. 35. .153 .164 .164 .163 .163 .160 .137 THICKNESSES | ||