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 performance of an 18000 turn coil within an earthed metal tube to reduce induced sparking.
| Identifier | ExFiles\Box 61b\4\ scan0211 | |
| Date | 26th February 1925 guessed | |
| -3- In an earthed metal tube. With the tall 18000 turn coil however, this reduction is not so noticeable, the initial spark energy being greater. On account of this and also as it is desirable to reduce the tendency for induced sparking to occur, it is suggested that the best proposition is now the earthed metal tube. EFC/HEW. | ||