| Year | 1912 |
| Date | 13-Jun |
| Volume | 26 |
| Issue | 581 |
| Page | 553 |
| Category | Lessons from the Laboratory |
| Part | |
| Title | Cutting Gear Wheels |
| Author | |
| Notes | Worm gear attached to milling appliance, worm gear with flat & cirved teeth, right-angle drive screw (skew?) gear, a multi-threaded screw: side & end view |