| Year | 1920 |
| Date | 18-Nov |
| Volume | 43 |
| Issue | 1,021 |
| Page | 408 |
| Category | Workshop |
| Part | 5 |
| Title | Small Power Machine Shop Calculations |
| Author | Hubert Bentley |
| Notes | Shaping and Slotting Machines. The feed mechanism, typical feed motion, common form of driving gear, typical cone drive, slotting machines, circular drive to table, weight of material removed |