Leopold's engine. Historical artwork of Leopold's non-condensing steam engine patented in 1720. It has two cylinders (upper right) that receive steam alternately from the furnace below (lower right). The pistons are thus alternately raised and lowered thereby raising and lowering the pump rods (left) to which they are connected by beams. This type of engine is a non-condensing engine because the steam is released into the atmosphere, instead of condensing within the cylinders. Published in History and progress of the steam engine, England, 1830.
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