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).
Graph showing speedometer correction curve test results for a Phantom III at Brooklands.
| Identifier | ExFiles\Box 155\1\ scan0323 | |
| Date | 29th June 1937 | |
| To Rm{William Robotham - Chief Engineer} From Rm{William Robotham - Chief Engineer}/IMW{Ivan M. Waller - Head of Chateauroux} CURVE NO. 3. 32 Ex. PHANTOM III. SPEEDOMETER TESTS. BROOKLANDS. CORRECTION CURVE FOR USE IN PREPARING PERFORMANCE CURVES ① + ②. 29-6-37. STANDARD A.T. SPEEDOMETER DUNLOP 7.00-18 TYRES. TREADS HALF WORN DOWN. Y-Axis: ACTUAL TIMED SPEED. X-Axis: SPEED SHOWN BY SPEEDOMETER. M.P.H | ||