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).
Table of dynamometer ratios for Humber, Dodge, and Hupmobile cars at different RPMs.
| Identifier | ExFiles\Box 126\2\ scan0018 | |
| Date | 3rd May 1921 guessed | |
| HS.{Lord Ernest Hives - Chair} X.1525 X.1525. X/4213 X 4212 AMERICAN CARS. Dynamometer Ratios. Dyn: Revs. Revs. Humber. Dodge. Hupmobile. ------------------------------------------ 500 74 79 67 750 111 118.8 101 1000 148 158 135 1250 185 198 168 1500 222 237 202 1650 259 277 236 2000 296 316.8 270 | ||