| Year | 1940 |
| Date | 28-Nov |
| Volume | 83 |
| Issue | 2,064 |
| Page | 425 |
| Category | Hot Air |
| Part | |
| Title | Practical Notes on Hot Air Engines |
| Author | "Artificer" |
| Notes | A proposed design, for a rotary displacer, cross-section of modified engine, rotary pistons, hot-air turbines, a vertical cylinder engine, air compressor |