| Year | 1907 |
| Date | 28-Nov |
| Volume | 17 |
| Issue | 344 |
| Page | 526 |
| Category | Electronic |
| Part | |
| Title | Notes on Wireless Telegraphy Apparatus |
| Author | V.W.Delves-Broughton |
| Notes | The Lodge-Muirhead Coherer. Castelli coherer, method for accurately centreing iron pole-pieces in glass tube |