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).
Comparative acceleration graph plotting car speed against time for three vehicle models.
| Identifier | ExFiles\Box 113\2\ scan0190 | |
| Date | 30th October 1933 | |
| COMPARATIVE ACCELERATION ORIGINAL 20 H.P. CAR 20/25 H.P. CAR PRESENT 20/25 H.P. CAR PRESENT 20/25 H.P. 37CWT. ORIGINAL 20/25 H.P. 37CWT. 1924 20 H.P. CAR (OPEN) (31CWT.) CAR SPEED (M.P.H.) TIME (SECS.) 30.10.33 | ||