| Year | 1930 |
| Date | 30-Jan |
| Volume | 62 |
| Issue | 1,499 |
| Page | 107 |
| Category | Horology |
| Part | |
| Title | Electric Chiming and Striking Clocks |
| Author | F.Booker |
| Notes | Some Notes on the Construction of Motor-driven Gear. Six-pole armature, arrangement of brushes, of electrically controlled brake, motor plates, sketch of worm-driven movement |