| Year | 1984 |
| Date | 20-Apr |
| Volume | 152 |
| Issue | 3,727 |
| Page | 470 |
| Category | Horology |
| Part | 6 |
| Title | A Grasshopper Skeleton Clock |
| Author | W.R.Smith (U.S.A.) |
| Notes | Installing the mainspring, a mainspring length gauge, the mainspring ratchet, the mainspring click, the great wheel |