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 report and speedometer inaccuracy for an Essex car.
| Identifier | ExFiles\Box 21\6\ Scan024 | |
| Date | 15th March 1921 | |
| X.4217 To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} Hs{Lord Ernest Hives - Chair}/LG15.3.21. RE. ESSEX CAR. We attach herewith a report giving particulars and performance of the above car. We wish to point out that the miles per hour, recorded by the speedometer fitted to this car, may not be correct. The reason we point this out is because we have found that on the Manson Car, although the mileage was recorded correctly, the speedometer records about 15% high at 60 M.P.H. When we get the Essex Car back, we will calibrate the speedometer so that these figures can be corrected. Hs.{Lord Ernest Hives - Chair} (upside down text at bottom) R R 83A (100) (T) (S.L.) FHS. 786. 10-12-20-C. 2947 | ||