| Year | 1930 |
| Date | 10-Jul |
| Volume | 63 |
| Issue | 1,522 |
| Page | 33 |
| Category | Electrical |
| Part | 2 |
| Title | Electric Motor Installation and Management |
| Author | A.H.Avery |
| Notes | Exciting coil or solenoid, magnetising an iron core, bent into form of a field-magnet, torque due to fixed and movable magnets, production of poles in field magnet and armature |