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).
List comparing the weights of three different types of dynamos.
| Identifier | ExFiles\Box 168a\3\ img128 | |
| Date | 7th January 1935 guessed | |
| 26099 DYNAMO WEIGHTS. Present standard Bentley - 30 lbs. 8 ozs. Small 20/25 type with fan ventilation - 23 lbs. 0 ozs. La{L. A. Archer} Salle (same size as 20/25) - 24 lbs. 12ozs. | ||