| Year | 1940 |
| Date | 14-Nov |
| Volume | 83 |
| Issue | 2,062 |
| Page | 375 |
| Category | Hot Air |
| Part | |
| Title | Practical Notes on Hot Air Engines |
| Author | "Artificer" |
| Notes | Piston, connecting-rods, component parts of the Heinrici 30 mm engine, displacer-rod, displacer, flywheels, pivot pins |