From 8 to 9 Ibs. of Newcastle coal would, with this engine, be found to do the same quantity of work. I have drained two districts of fen-land, near March, in Cambridgeshire, where the engine's power bears about the proportion of 10 horses... Outlines of a new plan for tilling & fertilizing land - الصفحة 98 بواسطة Thomas Vaux (agriculturist.) - 1840 - عدد الصفحات: 214 عرض كامل -
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