| Year | 1936 |
| Date | 21-May |
| Volume | 74 |
| Issue | 1,828 |
| Page | 487 |
| Category | Electrical |
| Part | |
| Title | Electromagnetic Devices. With notes on the design of magnets for the model maker and inventor |
| Author | A.H.Avery |
| Notes | Curve of traction for coil-and-plunger magnet, force of attraction, ironclad electromagnet, curve of traction, electrical and mechanical equalisers for long-range magnets, long-range magnets, electromagnetic cam, coned polepiece, conclusion |