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).
From E.J. Brock to Mr. Clark regarding a GII coil used for testing rotors.
| Identifier | ExFiles\Box 45\4\ Scan208 | |
| Date | 17th October 1923 | |
| X4079a 17.10.23. Mr. Clark. Herewith is one of the early GII coils in an ELO case. We have been using this coil for the past 6 months for testing rotors; sometimes it has been on open circuit for half an hour at a stretch. I thought this might interest you. EJ Brock. | ||