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).
Speedometer on a trials car reading 6% slow due to temperature error and recommending an updated duralumin cup.
| Identifier | ExFiles\Box 50\4\ Scan148 | |
| Date | 1st September 1927 | |
| To Hm. {Capt. W. Hallam - Head Repairs} } FROM Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} To BY. {R.W. Bailey - Chief Engineer} } X4308 Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} 4/LG6. 9.27. c. to EP. {G. Eric Platford - Chief Quality Engineer} Mx. {John H Maddocks - Chief Proving Officer} Roy. {Mr H. Royce - Buyer} C. A.T. SPEEDOMETER. X788 In our recent test of a trials car (46-PK) on Brooklands, we observed that the speedometer was reading about 6% slow. We consider that this was due to the temperature error of the instrument as explained in our Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} 1/LG13.7.27. We recommend that all speedometers fitted to trials cars should be equipped with the latest type of duralumin cup which obviates this error. Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} | ||