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).
Dynamometer test results for an Essex Car, showing horsepower and load at various engine revolutions.
| Identifier | ExFiles\Box 21\6\ Scan047 | |
| Date | 16th January 1922 guessed | |
| Handwritten: X4217 Report Printed: ESSEX CAR. DYNAMOMETER TEST. Eng. Revs. HP. Lbs. 500 6.197 62 750 11.62 77 1000 15.4 85 1250 20.6 85 1500 25.9 88 1750 30.1 93 2000 38.2 93 2250 40.2 85 2500 38.73 72 2750 39.3 67 Watermark: DIGBY MASCOT COXLEY | ||