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).
Letter discussing an investigation into ultra-violet ray resisting glass to prevent the fading of red liquid in gauges.
| Identifier | ExFiles\Box 61\3\ scan0180 | |
| Date | 15th May 1931 | |
| Messrs.Rolls-Royce,Ltd., Date 15.5'31. Page 2 the dates of any changes which they have made, of which we have as yet no knowledge. During the past week we have been investigating the sources of supply in this country of ultra-violet ray resisting glass. This glass is used by the King-Seeley Corpora- tion and ourselves in the Industrial and Aeroplane type gauges. In instances where these gauges are mounted on the outside of a building, or on a tank exposed to the sun in tropical climates, it has been found that the red liquid has a much more severe service to perform as regards retaining its dye than in the general run of motor car work. Therefore if the ultra-violet ray glass is sufficiently transparent for your instrument board purpose, we would ask you to seriously consider permitting us to fit this glass to your gauges at the very earliest possible moment after you have inspected and tested it, as we feel confident that this will satisfactorily eliminate the fading of the liquid, if the case of the fading in the gauges at your works is really due to exposure to the light and not to some other action; this being the only reason we at present know for the fading. The glass itself is of course more expensive than the ordinary transparent glass at present fitted to your instruments, | ||