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).
Query regarding a discrepancy in S.S. Chassis speedometer drive gear ratio calculations.
| Identifier | ExFiles\Box 50\4\ Scan310 | |
| Date | 20th September 1929 | |
| By {R.W. Bailey - Chief Engineer} /Mtn. from EFC. {E. Fowler Clarke - Electrical Engineer} X4308. EFC {E. Fowler Clarke - Electrical Engineer} 5/AD20.9.29. X.4308. S.S. CHASSIS SPEEDOMETER. I have your By {R.W. Bailey - Chief Engineer} /Mtn10/N18.9.29 which I do not understand because my previous information from your Dept. is that S.S. speedometer revs. per car mile of drive = 826 S.S. " " per counter " of instruments supplied = 810. the speedometer drive gear ratios being 41/11 x 26/8 x 2/18 = 1.346 O.K. Will you therefore please let me know (1) To what your figure of 765 refers. (2) The new speedometer drive gear ratios, if these have been altered. EFC. {E. Fowler Clarke - Electrical Engineer} | ||