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).
Proposing a new layout for the 20/25 'U' Series instrument board to resolve magnetic interference with the petrol gauge.
| Identifier | ExFiles\Box 62\2\ scan0069 | |
| Date | 23th April 1932 | |
| X6135 E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. TO. By.{R.W. Bailey - Chief Engineer} c. BY/Rd. Hs{Lord Ernest Hives - Chair}/Wst.2/MA. 23.4.32. 20/25 "U" Series instrument board. In testing one of these R.R. patches, fitted with Smith instruments, on the road it has been found that the electric petrol gauge which is placed next to the speedometer is affected by the magnetic impulses radiated from the rotating magnet inside the A.T. magnetic speedometer. These impulses cause the petrol gauge needle to oscillate badly. Moving the petrol gauge to the position immediately beneath the ammeter prevents any oscillation of the petrol gauge needle. We should be glad therefore if you will arrange to alter the position of the petrol gauge accordingly on drawing D.53102. The position of the instruments will then be, looking at the front :- Speedometer - extreme left. Thermometer - Top left. Oil gauge - bottom left. Petrol gauge - bottom right. ammeter - top right. Clock - extreme right. Also we think it would be a distinct improvement as regards appearance if the needle of the Smith petrol gauge could be made the same width as the needle of the Lucas Ammeter. Hs{Lord Ernest Hives - Chair}/Wst. | ||