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 metallic versus non-metallic tubing on ignition wiring and spark intensity.
| Identifier | ExFiles\Box 61b\4\ scan0200 | |
| Date | 2nd February 1925 guessed | |
| -2- Contd. (1) To minimise the effects on the other wires we require to earth the two ends of the tube. (2) To keep the main spark up in intensity we require to have the tube insulated. Whichever course we adopt, with a metallic tube we have an undesirable condition. Therefore, it would appear that the only course to adopt is to use a non-metallic tube. This of course does not entirely eliminate both undesirable conditions as the wires are still bunched together and allow of a slight influence from the wire carrying the discharge to the others, also on the other hand, the bunching of the wires together still leaves some capacity effect to lower the sparking voltage of the principal discharge. There is, however, no question but that there is a nett gain, taking everything into consideration. This will especially be the cause if it can be arranged for the central wire from coil to distributor not to be passed through this tube in company with the others. This condition will of course exist if the coil be placed close to the distributor. EFC. | ||