This Rider external combustion Sterling-cycle engine, manufactured by the Rider-Ericsson Company, was used to power a water pump supplying a community of estates in Tenants Harbor, Maine, during the first part of the 20th century.

It is an external-combustion engine because it operates on hot air heated over the fire box in which straw, wood, coal, etc. is burned rather than fuel burned inside the cylinders as in automobile engines.

Specifications: Two-cylinder; 6 in. bore.

Accession no. 1978G40

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