Blueprint graph of various engine performance curves.
| Identifier | Morton\M4.2\ img023 | |
| Date | 1st January 1923 guessed | |
| B.H.P. CURVE. I.H.P. CURVE. M.E.P. CURVE. B.M.E.P. CURVE. T.E.P. CURVE. | ||
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).