Experimental Science. Elementary Practical and Experimental Physics Volume 2

Experimental Science. Elementary Practical and Experimental Physics Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: ...by Dr. Krugener, and differs in some respects from the above. It has a large finder, which includes the same area as the plate upon which the impression is taken. The finder lens is above the view lens, and the plates are transferred before the impression is taken instead of afterward, as in the camera above referred to. A mahogany case of convenient form is divided into four compartments by horizontal and vertical partitions. Division b contains a mirror, b', placed at an angle of 450, which throws the image formed by the lens;, upon the ground glass, /, . so that during the taking of the impression the position of the object may be observed. Division a contains from 12 to 24 sensitive plates, firmly pressed by a spiral spring, by which they are moved forward, when one of the plates in division, d, is shifted by means of the transferring rod, i, so that it may receive the light from the object glass, O. The next plate moves in front of the one already exposed. Every plate is fixed in a small shield, so that the forward plate protects all those behind it from the injurious influence of the light. The object glass is closed independently of the shutter. The instantaneous shutter is placed in a compartment in front of the objective, and is therefore out of sight and protected from injury. CLOUD PHOTOGRAPHY. The annexed half tone engraving is from a cloud photograph taken by Mr. A. J. Henry, of the Weather Bureau. This print was made from a single negative taken with one exposure, and it is through the courtesy of Mr. Henry and Mr. McAdie, of this bureau, that we are enabled to give our readers the secret of this remarkable effect. The picture is taken through a monochromatic screen. The one found most effective is that formed of a...show more

Product details

  • Paperback | 128 pages
  • 189 x 246 x 7mm | 240g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236772156
  • 9781236772152