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).
New design for a speedometer drive, proposing a pulley and belt system driven from the propeller shaft.
| Identifier | ExFiles\Box 33\4\ Scan009 | |
| Date | 10th January 1919 | |
| Extract from - EH1/1g.10119. To E.{Mr Elliott - Chief Engineer} from EH. 10th January 1919. X.1756. With reference to your note E2/G.8119., there is one point you have not mentioned as regards the new car. It was arranged (see R's note R4/W.18816.) that on future cars where we do not have a speedometer drive from the gear box, that we should make and supply a proper speedometer pulley. With the pulley there would be a reduction gear so that the flexible drive for the speedometer would go at quarter engine speed. We want a gear similer to the speedometer drive we fit to aero engines except of course it will have a pulley on, which would be driven off the propellor shaft with a belt in the usual manner. You know from your own experience that the speedometer drives on our cars are a curse. Will you please let us know whether you think anything could be done in this matter. R.R. 235A (500 T) (B.D. 408. 25-4-17.) Bm. 2/158/13. | ||