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).
Blueprint graph comparing the power (M.E.P.) of Marmon, Humber, Buick, Hup, and Dodge cars.
| Identifier | Morton\M4.2\ img022 | |
| Date | 1st January 1923 guessed | |
| POWER 80 70 60 50 40 MARMON CAR. - M.E.P HUMBER CAR. - M.E. BUICK CAR. - M.{Mr Moon / Mr Moore} HUP CAR. - M.E. DODGE CAR. - M | ||