| Year | 1939 |
| Date | 25-May |
| Volume | 80 |
| Issue | 1,985 |
| Page | 603 |
| Category | Stationary Engine |
| Part | |
| Title | Two Simple Engines |
| Author | H.H.G. |
| Notes | Easily-made horizontal and vertical types with interchangeable parts. The frame of the vertical engine, the horizontal frame, isometric sketches |