| Year | 1979 |
| Date | 06-Jul |
| Volume | 145 |
| Issue | 3,612 |
| Page | 752 |
| Category | Workshop |
| Part | |
| Title | Some Notes on Worms |
| Author | Geo.H.Thomas |
| Notes | Form of teeth, effect of backlash, helix angle, gear trains, tools, the tip, screw cutting procedure, Acme threads, the handle |