| Year | 1920 |
| Date | 08-Apr |
| Volume | 42 |
| Issue | 989 |
| Page | 350 |
| Category | Workshop |
| Part | 2 |
| Title | Small Power Machine Shop Calculations |
| Author | Hubert Bentley |
| Notes | Belt-driven feeds, reversing gears and gear-driven feeds, change feed gear boxes, three-feed gear, four-speed gear, Hendey-Norton or tumbler gear, the apron mechanism, screwcutting, cutting speeds and weight of material removed |