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).
Temperature indicators, Dunlop and Rudge-Whitworth hubs, and petrol tank filler gauzes.
| Identifier | ExFiles\Box 159\7\ scan0053 | |
| Date | 2nd December 1919 | |
| Contd. -5- by.{R.W. Bailey - Chief Engineer} 2nd. December, 1919. Temperature indicator. It was proposed to use the Boyce distance type "Motometer" or the Foxborough instrument if the samples which we are obtaining prove satisfactory. The Foxborough instrument is regarded as the more hopeful since it is we understand, similar to the instrument fitted in England. It was suggested that the steel thermometer bulb be fitted in a casting built integrally on the top water pipe, so as to use the present single rubber hose connection to the radiator. It was thought undesirable to import the English instrument because of the difficulty of obtaining replacements, and the fact that the standard dial used in England is graduated in degrees centigrade. X.15 Dunlop Hubs. The driving serrations on Dunlop hubs are found to wear slack after twelve months' use. It is suggested to increase their length which we believe can be done without other alteration to the design. (If the front spokes break on Dunlop hubs the broken heads fall behind the thread in such a way that the thread is likely to be damaged in removing the hub. This has often occurred over here. Mr. Caswell has suggested the use of a light metal sleeve inside the hub shell beneath the heads of the front spokes to prevent this happening). X.421 On Rudge-Whitworth hubs there is not sufficient stroke on the locking nut. When the rear taper surface wears the nut tightens up against the end of the serrations without locking the hub on the back taper. The keys also wear slack on the Rudge-Whitworth hub, suggesting the desirability of finer serrations. If a petrol tank filler gauze of the present type is used, we believe it should not be lowered into the tank vertically but should be inclined backward at about 15°, so that it can be withdrawn parallel to the slope of the back of the body. This would render the gauze far more accessible, and has been suggested as an improvement on existing cars. These gauzes have to be renewed about every year as the American petrol corrodes the gauze. Contd. | ||