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 of specifications for the Propeller Shaft, Electrical system, and Controls.
| Identifier | ExFiles\Box 91\1\ scan0463 | |
| Date | 22th December 1936 guessed | |
| (sheet 3) Propeller Shaft. Hardy Spicer type - less costly. Electrical. 25/30 HP. Dynamo and Battery. Controls. Throttle control on facia board, no ignition lever. Octane selector under bonnet. | ||