| Year | 1920 |
| Date | 29-Apr |
| Volume | 42 |
| Issue | 992 |
| Page | 420 |
| Category | Workshop |
| Part | |
| Title | Grinding Twist Drills |
| Author | F.Hall Bramley |
| Notes | A Simple Tool for Ensuring Accuracy. Holder & mounting for, diagram of position of drills for grinding, plan & elevation of holder, details of swivelling holder, details of components |