| Year | 1908 |
| Date | 09-Apr |
| Volume | 18 |
| Issue | 363 |
| Page | 348 |
| Category | Electronic |
| Part | |
| Title | Notes on Wireless Telegraphy Apparatus |
| Author | V.W.Delves-Broughton |
| Notes | Interrupters. Sectional elevation, improved mercury break, action of ordinary vibrating mercury break, modification of a Wehnelt interrupter, platinum needle |