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 comparing the radiator efficiency of a 20 HP R.R. and a 20 HP Alfa Romeo during the Col de la Faucille hill climb.
| Identifier | ExFiles\Box 77\4\ scan0371 | |
| Date | 15th December 1924 guessed | |
| COMPARISON RADIATOR EFFICIENCY 20 H.P. R.R. 20 H.P. ALFA ROMEO COL DE LA{L. A. Archer} FAUCILLE CORNERS EVERY 150 YDS. METRES RISE MEAN RADIATOR TEMP C° ATMOSPHERIC TEMP. DISTANCE COVERED. KILOMETRES. INCREASE/KILOMETRE .942 C° INCREASE/KILOMETRE .76 C° A ALFA ROMEO B. 20 H.P. R.R. | ||