| Year | 1950 |
| Date | 30-Mar |
| Volume | 102 |
| Issue | 2,549 |
| Page | 420 |
| Category | Horology |
| Part | |
| Title | Further Notes on an Electric Clock with a Semi-Free Balance |
| Author | Stanley J.Wise |
| Notes | General side view assembly, general front view assembly, front view of switch assembly, front plate, dial mechanism, assembly of ball-bearings, centre wheel assembly |