| Year | 1922 |
| Date | 25-May |
| Volume | 46 |
| Issue | 1,100 |
| Page | 506 |
| Category | Testing |
| Part | 7 |
| Title | Precision. Screwcutting |
| Author | |
| Notes | Microscope attachment, "go" and "not-go" screw ring gauge, form cutters for Whitworth threads, tool-box, cutting precision screws, chasing, gauge for setting screw-cutting tools, measuring accurate lead screws |