ENYS, John S. Remarks on the duty of the steam engines employed in the mines of Cornwall at different periods. London, Reprint from Trans.Inst. Civ.Eng. 1840
4to. 18pp. Orig. printed wrappers. Enys was a Cornish landowner, married to the daughter of Davies Gilbert and passionately interested in technology, notably the improvement of the Cornish engine. The present paper is concerned with methods of calculating the power of steam to relate it to the work produced by any given engine. Enys discusses earlier attempts, pointing out that in an engine working expansively as Cornish engines did, it was better to take the pressure in the cylinder at the closing of the steam valve, rather than pressure in the boiler, as the basis of calculations of the gross power supplied at each stroke. He goes on to compare and contrast the performance of engines at several Cornish mines.
£150
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