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).
Comparative test results for a 20/25 speedometer EX 18-GIV before and after a 10,000-mile test.
| Identifier | ExFiles\Box 59\2\ Scan107 | |
| Date | 1st March 1931 | |
| Hs{Lord Ernest Hives - Chair}/AJL. from EFC. c. Hs.{Lord Ernest Hives - Chair} X6051b EFCL/AML.3.31. X.6051b 20/25 SPEEDOMETER EX 18-GIV. In our EFCL/AML.3.10.30 we recorded the result of test of this instrument previous to the 10,000 mile test. It has also been again tested subsequent to the 10,000 mile test and the comparative readings of the two tests are as follows :- Temperature M.P.H. indicated (°C) at 600 R.P.M. exactly. Before 10,000 After 10,000 mile test. mile test. 16.0 47.2 - 16.5 - 46.8 20.0 46.8 46.5 22.0 46.6 46.1 24.0 46.4 45.9 26.0 46.2 45.7 28.0 46.0 45.6 30.0 45.8 45.4 32.0 45.6 45.2 The correct miles per hour reading when driven at 600 R.P.M. is 48.5. It will be seen that the reading of the instrument has altered comparatively slightly, in this instance becoming slightly less than previously. It was, as reported in our EFCL/AML.3.10.30, somewhat low at the beginning of the test. EFC. | ||