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).
Fading and darkening issues of the liquid used in gauges, referencing King-Seeley Corporation tests.
| Identifier | ExFiles\Box 61\3\ scan0205 | |
| Date | 25th June 1931 | |
| Messrs.Rolls-Royce, Ltd., Date 25.6.31. Page 2 we may be supplying to you from now onwards. The experience of the King-Seeley Corporation, in connection with tests which they have made over a very long period of time, both in service and in the laboratory, indicates that fading troubles have been less apparent since the introduction of the fused seal, so this we think can be dismissed from our minds, it being coincident with the alteration which they made in their mixture by the addition of bromoform, to deal with lower temperature conditions than will ever be experienced in automobile use. Our future supplies of liquid for this purpose will revert to the original mixture of acetylene tetrabromide dyed under their standard system. King-Seeley's experience and also our own in the research association's tests here, indicate that first of all a darkening of the liquid takes place, although this may not have been noticed either on the car which you mention, or on the chassis which was standing in the shop. Thereafter fading may take place, and is probably more noticeable in a gauge which is not in constant working order. That is to say a small amount of liquid standing in the glass tube of a gauge on a stationary chassis would probably be affected in a shorter space of time than one which was constantly in use, | ||