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 comparing the percentage error of a standard 1926 A.T. speedometer and an improved July 1927 version against temperature rise.
| Identifier | ExFiles\Box 50\4\ Scan128 | |
| Date | 14th July 1927 guessed | |
| VARIATION IN READING OF A.T SPEEDOMETER WITH TEMP. RISE Y-AXIS (LEFT): M.P.H. SLOW, 8, 7, 6, 5, 4, 3, 2, 1, 0, FAST Y-AXIS (RIGHT): PERCENTAGE ERROR, 14%, 12%, 10%, 8%, 6%, 4%, 2% X-AXIS: SPEEDOMETER TEMPERATURE C°, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34 DATA LINES: STANDARD 1926 IMPROVED JULY 1927 | ||