2026-09-28T10:55:09+01:00https://marinefinds.org.uk/datalabs/terminology/object/format/jsonhttps://marinefinds.org.uk/datalabs/terminology/object/format/xmlhttps://marinefinds.org.uk/datalabs/terminology/object3525138367TRIPLE EXPANSION ENGINEYA design of steam engine in which either three cylinders, in the case of vertical engines, or four cylinders on horizontal engines, permit steam to be expanded three times as it passes through the installation.546P