| Year | 1956 |
| Date | 15-Nov |
| Volume | 115 |
| Issue | 2,895 |
| Page | 692 |
| Category | Horology |
| Part | |
| Title | Battery driven pendulums |
| Author | S.G.Dunleavy |
| Notes | Experiments in the design of Hipp type electric pendulum clocks. Making a test rig, a working compromise, the trigger in action, pendulum design, timing the contact, working range of magnet, adjustments, altering swing, solving a snag |