The idea of a portable steam engine became practicable with the introduction of high-presure non-condensing engines, pioneered by the Cornish engineer Richard Trevithick (1771-1833) in 1802. This type of engine was quite easily transported (being self-contained) and needed practically no foundations. However, not being mounted on wheels it was intended for more permanent situations than the fully portable engine. Plate from 'Stationary engine driving: a practical manual for engineers in charge of stationary engines' by Michael Reynolds, published in London in 1881.
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