| Year | 1999 |
| Date | 13-Aug |
| Volume | 183 |
| Issue | 4,100 |
| Page | 200 |
| Category | Horology |
| Part | 13 |
| Title | A 3/4 Second Pendulum Electric Clock (C.R.Jones) |
| Author | John Wilding |
| Notes | Describes the collets and mounts the wheels. Centre arbor, the friction spring, drilling the pin hole, backstop block, pivot pin and operating pawl, references |