| Year | 1940 |
| Date | 05-Dec |
| Volume | 83 |
| Issue | 2,065 |
| Page | 442 |
| Category | Hot Air |
| Part | |
| Title | Practical Notes on Hot Air Engines |
| Author | "Artificer" |
| Notes | A typical hot-air engine driven fan, piston and gland packing, rolling rubber ring packing, eliminating the piston, simple diaphragm, improving furnace design, fabric bellows, increasing volumetric efficiency, size of displacer chamber, conclusion |