| Year | 1985 |
| Date | 01-Mar |
| Volume | 154 |
| Issue | 3,748 |
| Page | 258 |
| Category | Hot Air |
| Part | |
| Title | Arjay. A concentric piston hot air engine |
| Author | Roy Johnstone (Australia) |
| Notes | Displacer cylinder, power cylinder, power piston, displacer piston and rod, base plate, crank bearing, crank and shaft, water jacket, power connecting rod, return crank, displacer connecting rod, burner, stand, flywheel, assembly of parts, assembly board |