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).
Performance graph plotting horsepower for a GII engine against RPM, comparing bench and dynamometer results.
| Identifier | ExFiles\Box 181\M7\ img072 | |
| Date | 14th February 1923 guessed | |
| OMETER HP GII BENCH HP GII DYNAMOMETER R.P.M. 1250 1500 1750 2000 | ||