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).
The material and construction of a gauge, considering the use of gun-metal versus aluminium and its interaction with Acetylene Tetrabromide.
| Identifier | ExFiles\Box 44\4\ Scan134 | |
| Date | 11th December 1929 | |
| Messrs.Rolls-Royce, Ltd. Date 11.12.29. Page 2 the material of the gauge. The only disadvantage that we can see is the increase in weight of a very small part, namely, the body only of the gauge. All the fittings which we have used in the past which came in contact with Acetylene Tetrabromide, have been of brass or gun-metal, owing to the fact that these metals are definitely not attacked. There is another point to be borne in mind with regard to the new design which we have suggested for the top connection. So as to avoid the possibility of adding an unnecessary joint which could become loose, and so cause an air leak, we solder the body of the union into the top of the gun-metal body. We have had very little experience of some of the new methods of soldering these unions to aluminium, and we would hardly like to recommend it without further experience, but we do see a definite disadvantage if we have to screw the union into the aluminium body, even were your chemist able to device a method of treating the aluminium so as to prevent its attack by Acetylene Tetrabromide. Again the thread and seating might be machined directly on an extension of the aluminium body, but in the event of the thread or seating being damaged, it would necessitate | ||