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).
Hand-drawn sketch of a speedometer drive mechanism.
| Identifier | ExFiles\Box 181\M11\ img176 | |
| Date | 1st May 1919 guessed | |
| RR SPEEDOMETER DRIVE VEE PULLEY SAME SIZE AS DRIVING PULLEY SWIVEL PIN FLEXIBLE DRIVE 4 TO 1 SPUR GEAR | ||