Photograph of a Ferranti stopwatch with a large seconds dial and a smaller minutes sub-dial.
| Identifier | ExFiles\Box 151\2\ scan0340 | |
| Date | 10th June 1938 guessed | |
| 9 8 7 6 5 4 3 2 1 0 MINUTES 9 8 7 6 5 4 3 2 1 0 FERRANTI SECONDS | ||
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).