| Year | 1939 |
| Date | 12-Jan |
| Volume | 80 |
| Issue | 1,966 |
| Page | 44 |
| Category | Workshop |
| Part | |
| Title | Beginner's Workshop Difficulties |
| Author | |
| Notes | Notes on Concentric Drilling. Further precautions, correcting untrue holes, the "steady bar" method, the boring-tool methos |