| Year | 1939 |
| Date | 18-May |
| Volume | 80 |
| Issue | 1,984 |
| Page | 590 |
| Category | Drilling |
| Part | |
| Title | A Drilling Machine |
| Author | G.E.Coupland |
| Notes | A practical machine designed for drills No.41 to 80. The complete machine, reasons for the design, points in design, construction described, general arrangement |