| Year | 1911 |
| Date | 30-Mar |
| Volume | 24 |
| Issue | 518 |
| Page | 291 |
| Category | Electrical |
| Part | 2 |
| Title | Some Early Electric Motors |
| Author | A.W.Marshall |
| Notes | Keegan's - shape of magnet poles, diagram of winding, magnet cores, details of bearing, Du Moncel's - details of friction roller, diagram of winding, oscillating electric motor, details of solenoid, Bourbouze's - solenoids & plungers, contact slide |