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).
Observation of an Aero Engine Electrical Speedometer fitted to an F.10 engine.
| Identifier | ExFiles\Box 165\4\ img100 | |
| Date | 25th November 1930 | |
| X1350 HS{Lord Ernest Hives - Chair}/ACL. from EFC. EFC2/AD25.11.30. X.1350. AERO ENGINE ELECTRICAL SPEEDOMETER We understand that this has now been fitted to an F.10 engine. Further that you will advise us when this engine is running so that we may make observation of the operation of this apparatus. EFC. | ||