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).
Order for a custom 20 HP speedometer with specific calibration and a cream dial.
| Identifier | ExFiles\Box 50\4\ Scan263 | |
| Date | 5th December 1928 | |
| X4308 To RDY/Ms. g from Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} 3/LG5.12.28. 20 HP. SPEEDOMETER. X4308 X5310 Will you please order for us one small dia. A.T. speedometer with a cream dial and black figures similar in colour to those supplied for the patch of instruments but with a standard casing. The speedometer should be calibrated to 680 revs/mile i.e., the car gear ratio is 5% lower than the standard 20 HP. Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} | ||