| Year | 1940 |
| Date | 21-Nov |
| Volume | 83 |
| Issue | 2,063 |
| Page | 400 |
| Category | Hot Air |
| Part | |
| Title | Practical Notes on Hot Air Engines |
| Author | "Artificer" |
| Notes | Some "different" hot-air engines, a combined hot-air engine and low-pressure air compressor, improved methods of application, combined engine and compressor, non-rotative hot-air engines, reducing displacer losses, design for rotary-displacer engine |