| Year | 2001 |
| Date | 15-Jun |
| Volume | 186 |
| Issue | 4,148 |
| Page | 605 |
| Category | Horology |
| Part | |
| Title | Horological Matters |
| Author | John Wilding |
| Notes | Fly-cutter for milling clock wheel teeth, refers to a useful book about materials, confirms the use of annealed mild steel for electro-magnets. Hardening and tempering, soft iron |