| Year | 1931 |
| Date | 15-Jan |
| Volume | 64 |
| Issue | 1,549 |
| Page | 70 |
| Category | Practical Letters from Our Readers |
| Part | |
| Title | The Old Dudley Beam Engine and Some Others |
| Author | Geo. B.Round |
| Notes | "Davy" patent gear of the 63-in. engine, valve gear of the Dudley beam engine, new horizontal engine, engine house of the 63-in engine |