| Year | 1912 |
| Date | 25-Jul |
| Volume | 27 |
| Issue | 587 |
| Page | 73 |
| Category | Lessons from the Laboratory |
| Part | |
| Title | Cutting Gear Wheels |
| Author | |
| Notes | Showing the process of cutting a worm wheel, hob & wheel holder, 3 1/2 lathe wheels arranged for 3 t.p.i, wheel holder & blank wheel |