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).
Request from EFC to HHC for two further mushroom type rotors for battery ignition tests.
| Identifier | ExFiles\Box 32\5\ Scan060 | |
| Date | 5th July 1927 | |
| X6096 To HHC. from EFC. EFC3/T5.7.27. MUSHROOM TYPE ROTOR. In accordance with EY/RD6/ML.8.3.27 and EFC4/T12427, will you please supply two further mushroom type rotors for the battery ignition tests. EFC. | ||