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).
Graph of Phantom I and Phantom II power curves, titled as a comparison for Phantom II and Ph.III models.
| Identifier | ExFiles\Box 94\3\ scan0059 | |
| Date | 11th June 1936 guessed | |
| CURVES SHOWING COMPARATIVE B.H.P's AT VARIOUS ROAD SPEEDS FOR P.II x PH.III B.H.P. M.P.H. P.II POWER CURVE STD. SILENCER ETC. P.I POWER CURVE STD. SILENCER ETC. R.m 155 C&S 5.36 | ||