Close-up photograph of a dynamo mounted next to a honeycomb radiator.
| Identifier | ExFiles\Box 48\3\ Scan315 | |
| Date | 1st January 1919 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).