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 different dynamo models.
| Identifier | ExFiles\Box 22\4\ Scan022 | |
| Date | 17th April 1935 guessed | |
| 44708 DYNAMO WEIGHTS. Present standard Bentley 30 lbs. 8 ozs. Small 20/25 type with fan ventilation 23 lbs. 6 ozs. La{L. A. Archer} Salle (same size as 20/25) 24 lbs.12 ozs. | ||