Photograph of an overdrive cone insert which has revolved in the outer cone, showing wear marks.
| Identifier | ExFiles\Box 136\2\ scan0359 | |
| Date | 28th December 1942 guessed | |
| OVERDRIVE CONE INSERT WHICH HAS REVOLVED IN OUTER CONE | ||
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).