| Year | 1936 |
| Date | 30-Apr |
| Volume | 74 |
| Issue | 1,825 |
| Page | 419 |
| Category | Electrical |
| Part | |
| Title | Electromagnetic Devices. With notes on the design of magnets for the model maker and inventor |
| Author | A.H.Avery |
| Notes | A simple design, short cuts, electromagnet with airgap, design of exciting coils, curves of excitation for air, cast and wrought iron |