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Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
ndian incke, water-colours : graveing; and, above all, the whole secret of mezzo-tinto, and the manner of it, which is very pretty, and good things done with it. — Pepys's Diary, Nov. 1, 1665. At Gresham College, the Royal Society meeting, Mr. Hooke explained to Mr. Pepys the art of drawing pictures by Prince Rupert's rule and machine and another of Dr. Wren's [Sir Christopher]; but he [Dr. Hooke] says nothing do like squares, or, which is best in the world, like a dark room. — Pepys, Feb. 21, 1666. These devices are apparently for copying; the former is probably on the principle of the pantograph; the squares is a familiar mode of reducing or enlarging by ruling off into equal numbers of squares the original and the paper on which it is copied. The dark room is probably the camera-obscura, in the simple form of a hole in a shutter of a darkened apartment. Cocker [the famous arithmetician] says, that the best light for his life to see a very small thing by, contrary to