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).
And comparing designs for a petrol gauge, including a 'bull eye' and a bevel-geared magnetic type.
| Identifier | WestWitteringFiles\E\August1920\ Scan33 | |
| Date | 10th August 1920 | |
| ORIGINAL. To Da.{Bernard Day - Chassis Design} from R.{Sir Henry Royce} c. CJ. c. E.{Mr Elliott - Chief Engineer} c. BY.{R.W. Bailey - Chief Engineer} c. Hs.{Lord Ernest Hives - Chair} S.E.C. X.3852. RE PETROL GAUGE. Re Bn{W.O. Bentley / Mr Barrington}'s idea of "bull eye", this should be tested to see if there is any hope of it being sufficiently visible. This should be done correctly (optically), but temporary in every other way, with water or parafin would do. Re Bevel Geared Magnetic Gauge, it is very gratifying that both W.W. and Derby have independently arrived at the Bevel Gear arrangement. I think the best thing is to let this go forward, as arranged at W.W. which is the more robust and simple scheme, because we have been content to fit it in the back of the tank, centrally. My magnetic scheme should be adopted and I have sent in for a Provisional for this, the importance of the gauge reading correctly prompting me to say we might use this form as we cannot have a great weight of magnets, and we want it to be as correct as possible. My arrangement of magnets is undoubtedly more exact, as the distance between the driver and driven is so much less, and independent of end-play, which is always difficult to control exactly. I think the general dimensions should be increased and that the design "A" will be preferable with the slight modifications of chambering to avoid the risk of the blind hole coming through. Mr. Elliott's idea of making the nut into the bezel for the glass will probably be quite successful, and should Contd. R 'N' 3297 (100 L) | ||