A System of Familiar Philosophy; In Twelve Lectures Volume 2

A System of Familiar Philosophy; In Twelve Lectures Volume 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1802 edition. Excerpt: ...the image will he obscure, and ill defined, though larger: the leps n is brought nearer to, or farther from, the object, by an adjustmg screw so as to exhibit the image clear and sharp upon tfye screen. Thjs part of the instrument is calculated only to exhibit transparent objects, or rather such as light can pass through in part; but for opaque objects we use the Opaque Microscope.--Ores, flowers, insects, shells, &c, are seen to great advantage by this instrument. The mirror sl, fig 6 Plate XXXVII. and the lens c, are the fame as those of the solar microscope; but the converging rays from c are met by a diagonal mirror e n, which throws up the rays much condensed upon the opaque object 5 r; from the object they are reflected to the magnifier d, from which they proceed diverging to the screen p q, where the object will be painted, and greatly magnified. The objects are generally stuck by a wafer, or glue, to a fnlh Aider of wood, arid riot placed in the focus of the lens c', left they might be burnt. The Magic Lantern.--The office of the sun in the solar microscope is performed in this instrument by a candle, or lamp; rays from which pass through the lens a, fig. 7, Plate XXXVIL, besides others reflected by the concave mirror c. These rays are interrupted by the inverted cross, which, if coloured, must suffer them to pass on to the magnifying lens e; here they suffer such a refraction, as to go diverging to the screen, where the cross will be seen duly magnified. The lens e must be brought nearer to, or farther from, the object, till its focus exhibits the image clear and well defined on the screen. Ludicrous figures, well painted in transparent colours, have a laughable effect in a dark room; and serious subjects, such as the motions of the...show more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236487109
  • 9781236487100