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Home > Art, Film & Photography > Knowledge Volume 5; V. 31; With Which Is Incorporated Hardwicke's Science Gossip, and the Illustrated Scientific News. a Monthly Record of Science
Knowledge Volume 5; V. 31; With Which Is Incorporated Hardwicke's Science Gossip, and the Illustrated Scientific News. a Monthly Record of Science

Knowledge Volume 5; V. 31; With Which Is Incorporated Hardwicke's Science Gossip, and the Illustrated Scientific News. a Monthly Record of Science


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About the Book

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. 1908 Excerpt: ...itself. These plates are nearly as sensitive to red and yellow as to blue light, as is seen from the photograph of the red lines in the spectrum of neon (Fig. 1), obtained on a panchromatic plate. These plates must, of course, be handled and developed in total darkness, but the operation is quite easy. The plates being packed in pairs, face to face, they can be placed in the dark slide by feeling, even in total darkness. After exposure the plate is developed in the solution given below for exactly three minutes, and then washed and fixed. All these operations are easily carried out in the dark. It is hardly necessary to employ any screen with these plates, but if desired, a light yellow screen may be interposed for J or of the whole time of exposure and then removed. The photographs thus obtained extend from the red to a point in the violet considerably beyond the visible spectrum, thus, in Fig. 1, the eye cannot distinguish the lines beyond about 4200. If prisms are employed instead of gratirgs, the lines are no longer spaced according to wave-lengths, but are crowded together in the red, and spread out in the green and blue. Fig. 3 is a prismatic photograph of an electric discharge between magnesium electrodes in vacuo and superposed upon it the spectrum of iron for the purpose of furnishing reference lines. The photographs of diffraction spectra shown in this article, and those which appeared in the numbers of Amongst useful work to be done with the inexpensive equipment described, may be mentioned the photography of lightning and of meteors. If the camera with its grating is exposed on a dark night during a thunderstorm, we may be fortunate enough to obtain not only the record of the lightning flash itself, but also of its spectrum, consisting of...


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Product Details
  • ISBN-13: 9781236364302
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 314
  • Spine Width: 17 mm
  • Width: 189 mm
  • ISBN-10: 1236364309
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 562 gr


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Knowledge Volume 5; V. 31; With Which Is Incorporated Hardwicke's Science Gossip, and the Illustrated Scientific News. a Monthly Record of Science
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Knowledge Volume 5; V. 31; With Which Is Incorporated Hardwicke's Science Gossip, and the Illustrated Scientific News. a Monthly Record of Science
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