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).
Performance data table showing elapsed time versus speed in M.P.H for a 2nd Buick Car.
| Identifier | ExFiles\Box 124\3\ scan0106 | |
| Date | 7th January 1921 guessed | |
| Contd. -2- Time. M.P.H. 2nd. 0 mins. 10 Buick ½ " 22 Car. 1 " 26 1 " 47 secs. 34 YY | ||