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| Model Hot Air Engine Castings (Stirling Cycle)(14 Inch) | $ 345.00 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Solar Engine hot air ? Steam engine toy PM Research NY | $ 17.26 |
| Solar Engine hot air ? Steam engine toy PM Research NY | $ 51.00 |
| Stirling Solar Engine hot air ? steam engine toy phx az | $ 51.00 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Model Hot Air Engine Drawings (Stirling Cycle)(14 Inch) | $ 25.00 |
| Stirling Cycle Hot Air Engine by Solar Engines 1800 RPM | $ 219.00 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |