| Year | 1921 |
| Date | 22-Sep |
| Volume | 45 |
| Issue | 1,065 |
| Page | 233 |
| Category | Horology |
| Part | |
| Title | A Spring-Driven Clock Electrically Wound |
| Author | F.Booker |
| Notes | Details of the pendulum, motion work, back & side views showing automatic contact arrangement for winding spring, contact maker & switch arm, spring & barrel, gearing for winding, plan of winding gear, lower plate, back view |