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).
Design proposals for lever and spring mechanisms, including the use of tungsten and current reversal.
| Identifier | ExFiles\Box 35\6\ scan 239 | |
| Date | 27th January 1927 | |
| Contd. -2- EFC5/T27.1.27. The most hopeful proposal not yet properly tried out would seem to be larger pressure on points, especially in the case of tungsten. It has been difficult to obtain suitable springs of our present design. It is considered that the statics of the lever should be such that in the average position there is no resultant thrust at the pivot, i.e. the action of the spring should balance the action between the cam and rubbing block, so that the lever is in equilibrium (unstable) in the absence of the pivot. Periodic reversal of current has been proved to be helpful, but hardly practicable to apply. Reversal of direction of running contact breaker might give us some information and will be tried in due course. EFC. [Watermark text: 1304 MADE AT CROXLEY] | ||