Présentation de l'éditeur
Captain Trevithick put up in Dolcoath Mine a stone-crushing mill, having large cast-iron rollers, for breaking into small pieces the large stones of ore; it was spoken of as the first ever used for such a purpose ;the same form of crusher is still used in the mines. It caused a great saving compared with breaking by a hand hammer. lI saw at theW eith Mine in 1805 a portable high-pressure engine, made by Captain Trevithick. It was Called a puffer ;the cylinder was in the boiler ;the steam about 30 I bs. on the inch above the atmosphere. A wooden shed sheltered the engine and man. The facility of manufacture and cheapness of those engines caused them to be much used in the mines, and also elsewhere. 2M rs. Trevithick, about the time we are speaking of, accompanied her husband through one of theS taffordshire china manufactories. Trevithick said to the manufacturer, You would grind your clay much better by using my cast-iron rolls and high-pressure steamengine. The manufacturer begged him to accept a set of china. Mrs. Trevithick was disappointed at hearing her husband say No !I have only told you what was passing in my mind. Driving rolling-mills was among the early applications of the high-pressure steam-engines; but pulverizing 1R ecollections of the late Captain Charles Thomas, manager of Dole-oath, 2C aptain Samuel Grose srecollections. VOL. II.
(Typographical errors above are due to OCR software and don't occur in the book.)
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