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).
Test report for an A.T. type speedometer, detailing readings at various temperatures and RPMs.
Identifier | ExFiles\Box 59\2\ Scan003 | |
Date | 27th January 1930 | |
X 4308 27-1-30 X.4308. A.T. SPEEDOMETER TEST. Speedometer No. A.677.N800. 14/52 45.0 Speedometer type AT White dial Other particulars for 10000 miles on 23EX change of reading Temperature ( °C) | Miles per hour indicated at 600 R.P.M. exactly. | Revs. per mile of drive for correct speed reading. 18.0 | 44.8 | 804 25.0 | 43.6 | 826 30.0 | 42.8 | 841 Miles per hour at 1200 R.P.M. 25.0 | 89.2 | 806 30.0 | 87.4 | 824 3.6.29. EFC. | ||