| Year | 1923 |
| Date | 13-Dec |
| Volume | 49 |
| Issue | 1,181 |
| Page | 662 |
| Category | Electrical |
| Part | |
| Title | Relays. Their Resources and How to Make Them |
| Author | B.Clements-Henry |
| Notes | For single-battery working, control of larger current, ignition fuses and holder, reel for rapid laying and recovery of temporary line connections |