| Year | 1931 |
| Date | 03-Dec |
| Volume | 65 |
| Issue | 1,595 |
| Page | 535 |
| Category | Electrical |
| Part | |
| Title | Long-pull Silent and Effective Electro-Magnets |
| Author | F.B. |
| Notes | Simple form of magnet and armature, position of armature when attracted, position of armature after return stroke, the armature and its iron frame, the winding of bobbin, fixing magnets, the double bobbin type of this magnet |