| Year | 1923 |
| Date | 22-Nov |
| Volume | 49 |
| Issue | 1,178 |
| Page | 568 |
| Category | Electrical |
| Part | |
| Title | Relays. Their Resources and How to Make Them |
| Author | B.Clements-Henry |
| Notes | Elements of telegraphic relay, plan of simple type of relay, detached parts in detail, constructional sundries including coil winder |