| Year | 1997 |
| Date | 25-Apr |
| Volume | 178 |
| Issue | 4,040 |
| Page | 506 |
| Category | Horology |
| Part | |
| Title | Open Days at The British Horological Institute |
| Author | Stan Bray |
| Notes | Reports an annual event. Escapements: crown wheel, cylinder perfected by George Graham, duplex, lever, detente designed by Mudge. Wheel cutting machine designed and made by Mr Lynam (Chronos?), geometric armillary sphere & mystery clock by Mr Lynam, Upton House library, counterfeit watch destruction |