A model spirit or solid fuel fired Rider Ericsson hot air engine by Solar Engines with water jacketed concentric cylinders and curved spoked flywheel, burner, finished in black, wood mount -- 8 x 6½in. (23.3 x 16.5cm.) Instructions, tools, solid fuel; and a vertical Stirling Cycle engine with concentric cylinders and twin spoked flywheels, stand and burner, finished in black, red and polished brightwork -- 10in. (25.5cm.) high (A Lot)