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).
With diagrams on a governor-controlled fan and dynamo drive system.
| Identifier | ExFiles\Box 173\1\ img305 | |
| Date | 31th January 1934 guessed | |
| XI Have seen the latest drawing of the governor controlled fan speed. This is being worked at hard to provide a drive that also will not over speed the dynamo / many here are now belt driven! In its latest form The bottom pulley is spring loaded only and opens out to reduce drive ratio under the influence of the governor. | ||