A History of Inventions, Discoveries, and Origins. Johann Beckmann. Читать онлайн. Newlib. NEWLIB.NET

Автор: Johann Beckmann
Издательство: Bookwire
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Жанр произведения: Документальная литература
Год издания: 0
isbn: 4064066382865
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target="_blank" rel="nofollow" href="#ulink_9e6985a2-d813-595b-8267-08b09c3f9f08">668. In the sixteenth century, however, there were mills with different saw-blades, by which a plank could be cut into several deals at the same time. Pighius saw one of these, in 1575, on the Danube, near Ratisbon, when he accompanied Charles, prince of Juliers and Cleves, on his travels669. It may here be asked whether the Dutch had such mills first, as is commonly believed670. The first saw-mill was erected in Holland at Saardam, in the year 1596; and the invention of it is ascribed to Cornelis Cornelissen671; but he is as little the inventor as the mathematician of Joachimsthal. Perhaps he was the first person who built a saw-mill at that place, which is a village of great trade, and has still a great many saw-mills, though the number of them is becoming daily less; for within the last thirty years a hundred have been given up672. The first mill of this kind in Sweden was erected in the year 1653673. At present, that kingdom possesses the largest perhaps ever constructed in Europe, where a water-wheel, twelve feet broad, drives at the same time seventy-two saws.

      [The application of the steam-engine has in modern times almost entirely displaced the use of either water or wind as sources of power in machinery, and most of the saw-mills now in action, especially those on a large scale, are worked by steam. Some idea of the precision with which their operations are now accomplished may be obtained from the following fact. At the City of London saw-mills, the largest log of wood which had been placed on the carriage in one piece—a log of Honduras mahogany 18 feet long and three feet one inch square—was cut into unbroken sheets at the rate of ten to an inch, and so beautifully smooth as to require scarcely any dressing.]

      FOOTNOTES

      “Ut cui causa necis serra reperta fuit.”