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 from a draughtsman proposing a plug modification using fused metal instead of mercury.
| Identifier | ExFiles\Box 34\2\ Scan113 | |
| Date | 18th January 1919 guessed | |
| be preferable to the mercury cup one as it would be cheaper & although the fused metal would be lighter than mercury it would have a higher specific heat so that it should work equally well. If you send me sketch of present plug I will forward proposed modification. I am a draughtsman employed on Aircraft work in Messrs. Combe, Barbour's, Falls Foundry, Belfast. I would, of course, treat any communication as confidential. Trusting you will give the idea a trial, I am, Sir, Your obedient Servant, Thos. W. Hall. B.Sc. The Manager, Messrs. Rolls-Royce Co., Ltd. | ||