| Year | 1928 |
| Date | 05-Apr |
| Volume | 58 |
| Issue | 1,404 |
| Page | 323 |
| Category | Electrical Work |
| Part | |
| Title | An Automatic Charging Switch |
| Author | E.C.Ruddock |
| Notes | Method of winding electro-magnet, completed autoswitch, direction of winding, armature, adjustable weight and forked dipper, general layout |