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).
Listing the Back E.M.F. and Flux per pole values obtained for Motor 2.
| Identifier | ExFiles\Box 34\4\ Scan194 | |
| Date | 15th October 1929 guessed | |
| -3- Obtained for Motor 2. only :- Back E.M.F. 43.0 volts Flux per pole 17,170 lines. EFC/CAP. | ||