| Year | 1940 |
| Date | 11-Jan |
| Volume | 82 |
| Issue | 2,018 |
| Page | 32 |
| Category | Hot Air |
| Part | |
| Title | Hot Air Engines |
| Author | A.H.R. |
| Notes | Notes for a working model. Sectional elevation, plan and end view, connecting-rod and valve-rod, displacer piston (hollow), relative position diagram, motor piston |