| Year | 1940 |
| Date | 12-Sep |
| Volume | 83 |
| Issue | 2,053 |
| Page | 206 |
| Category | Hot Air |
| Part | |
| Title | Practical notes on Hot Air Engines |
| Author | "Artificer" |
| Notes | Diagram illustrating the principle of the Stirling engine of 1827, a small horizontal hot-air engine, the Robinson hot-air engine, operation of Stirling engine, elevation and plan of Robinson hot-air engine, the Robinson engine |