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).
Page discussing methods to alter spark effects by manipulating magnetic flux and secondary turns in an ignition system.
| Identifier | ExFiles\Box 4\5\ 05-page089 | |
| Date | 21th October 1920 guessed | |
| -20- Contd. improved by reducing the main magnetic flux. A third method would be to reduce the number of secondary turns. Each of these ways would decrease the proportion of arc effect to initial oscillatory spark. This state of affairs if, however, allowed to exist, results in an unsymmetrical distribution of flux, which causes the secondary sparks due to break on one side to become different from those on the other side. For instance, the condition may be obtained in which, for the same intensity of initial oscillatory spark, the positive high tension discharges contain a greater proportion of arc effect than the negative, i.e. supposing equal high tension gaps. By temporarily reducing a spark gap at which a lesser arc spark is taking place by bridging it with a piece of metal, the two types of spark may be permanently interchanged from one group of gaps to the other, corresponding now to an unsymmetrical distribution of flux the other way round. | ||