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).
The effects of induced sparks between magneto and battery ignition wires.
| Identifier | ExFiles\Box 61b\4\ scan0208 | |
| Date | 19th February 1925 guessed | |
| -2- Contd. Upon earthing the battery ignition wires there there was no appreciable difference in the intensity and regularity of the magneto sparks on 5.5 mm. gaps in air. With the magneto disconnected and the battery ignition wires sparking, small induced sparks could also be obtained from the magneto wires at the respective spark gaps but of a much smaller magnitude as shewn in the following table :- Spark Gap No. Max. Gap allowing regular induced sparks to jump. 1 .005" 2 .004" 3 .004" } INDUCED SPARKS 4 .004" ON M.I. GAPS. 5 .003" (INSng. TUBE) 6 .004" No appreciable difference was observed in the intensity and regularity of the battery ignition sparks on 6.5 mm. gaps in air, when the magneto wires were earthed. In conclusion it will be seen that the greatest induced effect appears to be from the magneto wires to the battery ignition wires, the effect of earthing wires in the immediate neighbourhood of the live wires shewing no appreciable detrimental effects. EFC/HEW. | ||