Sketches illustrating rubbing marks and distortion on a cylindrical component.
| Identifier | ExFiles\Box 81\2\ scan0086 | |
| Date | 1st December 1923 guessed | |
| D A B C Rubbing marks at side. Hard rubbing marks at top | ||
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).