| Year | 2016 |
| Date | 22-Jul |
| Volume | 217 |
| Issue | 4,539 |
| Page | 176 |
| Category | Hot Air |
| Part | |
| Title | An Undertype Hot Air Engine |
| Author | Alan Pickering |
| Notes | A unique design for an engine with speed control. The magic engine, visibility, construction, flywheel and cylinders, making the motion, Mitchell lathe, reference |