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).
List of disadvantages concerning a mercury switch, including its junction lag, awkward fixing, and potential for oxidation.
| Identifier | ExFiles\Box 3\5\ 05-page016 | |
| Date | 21th December 1918 guessed | |
| -2- Contd. The disadvantages are :- (a) The mercury switch making and breaking contact at minimum speed appears to lag a little in its junction also it prevents us supporting the dynamo from a pivot and swigging it about its centre to tighten the belt. It necessitates a much more awkward kind of fixing. (b) It is not so compact or quite so water tight in design and not nearly so cleanly designed and executed. (c) A further trouble might occur after some time in use is that the mercury may oxidise. (Sgd) EWHB. | ||