COVID-19.
MMM is still open for online orders and able to ship orders out but Royal Mail no longer guaranteeing delivery times so some delivery may take a bit longer.

Stirling Engines

Stirling Engines are closed cycle regenerative gas engines, which is powered by the expansion and contraction of gas. The fixed amount of gas inside the Stirling Engine, is transferred back and forth between a hot end and a cold end, which cyclically expands and contracts. The engine works by converting heat into mechanical energy. The stirling engine is a gamma-type Stirling engine uses two pistons, in parallel-arrangement.
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