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).
Specification sheet detailing speedometer revolutions per mile for various models and axle configurations.
| Identifier | ExFiles\Box 50\4\ Scan331 | |
| Date | 12th November 1929 | |
| X 4308 12.11.29. X.4308. SPEEDOMETER REVOLUTIONS PER MILE. 20 H.P. Chassis average and minimum for 11/50 axle 750 Instruments " " " " 740 Chassis average for 12/50 axle 687.5 Instruments " " " " 675 Later instruments for 11/50 axle 720. S.S. (11/41 axle) Chassis average 608.7 x 1.346 = 819 " minimum 595 x 1.346 = 801 Early instruments 810 Later " 765 EFC. | ||