Photograph of a gearbox layshaft with multiple helical gears and one bevel gear.
| Identifier | ExFiles\Box 109\4\ scan0125 | |
| Date | 5th July 1939 guessed | |
| ", | ||
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).