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).
Comparison tables of various cars' face area, volume per displacement, and on-track temperature.
| Identifier | ExFiles\Box 29\3\ Scan278 | |
| Date | 25th August 1930 guessed | |
| TABLE 1 CAR. Face Area per 1000 litre disp. per mile. ROLLS-ROYCE 25 HP. 83.0 sq.ins. CHRYSLER 75. 82.7 sq.ins. HISPANO 77.2 sq.ins. ROLLS-ROYCE 40/50. 71.2 sq.ins. GRAHAM PAIGE 65.2 sq.ins. MARMON 63.0 PIERCE ARROW. 54.4 TABLE 2 CAR. Volume per 1000 litre disp per mile ROLLS-ROYCE 25 HP. 308. HISPANO 308. ROLLS-ROYCE 40/50. 285. GRAHAM PAIGE 220. CHRYSLER 75. 207. MARMON 173. PIERCE ARROW 129.2 TABLE 3 CAR. Temp. at 60 M.P.H. on Track. ROLLS-ROYCE 40/50. Vent. Bonnet. 71°C. CHRYSLER 73°C. HISPANO. 74°C. GRAHAM PAIGE. 77°C. PIERCE ARROW. 82°C. MARMON 85°C. Engine tightening up. 25 HP. ROLLS-ROYCE. Not yet recorded. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||