| Year | 1933 |
| Date | 11-May |
| Volume | 68 |
| Issue | 1,670 |
| Page | 439 |
| Category | Electrical |
| Part | |
| Title | A Small Twin Solenoid Magnetic Engine |
| Author | A.G.Pretty |
| Notes | Diagram showing arrangement of cranks and solenoids, details of contact-making device, reversing switch and wiring diagram |