| Year | 1940 |
| Date | 07-Nov |
| Volume | 83 |
| Issue | 2,061 |
| Page | 363 |
| Category | Hot Air |
| Part | |
| Title | Practical Notes on Hot Air Engines |
| Author | "Artificer" |
| Notes | Machining castings of Heinrici 30 mm. Engines, body casting, flywheel and main connecting-rod, air chamber, main bearing standards, marking-out, miscellaneous details, crankshaft, cylinder |