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Home > Ophthalmic Literature Volume 16: (English)
Ophthalmic Literature Volume 16: (English)

Ophthalmic Literature Volume 16: (English)

          
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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. 1920 Excerpt: ...and found that a sample kept for eight months in the dark showed no change in brightness. Exposure to daylight of even a few seconds increases the luminosity as high as 100 times; the upper limit seems to be about 200 times of the original value. This increased luminosity is only temporary, and disappears after a longer or shorter interval to make room for the original intensity. For practical purposes it is good to keep the test object in absolute darkness for three to six hours before examination is begun. Best's adaptometer, alluded to in Y. B. 1918, v. 15, p. 156, has a 5x8 cm. surface covered with luminous paint; through screens and umbral glasses the light intensity of this surface can be diminished in such manner that each intensity is one-half of the previous one. The luminous plate is placed into a box which has a frosted glass of 6x8 cm. as the object of observation. Bringing the luminous plate nearer or farther the frosted glass introduces another variability of the light intensity. The adaptometer of Comberg consists of a long wooden box in which the distance of a surface covered with luminous paint from a milk glass, the object of observation, can be varied in a range from 0 to 30cm. In front of the milk glass is a smoked glass of 75 per cent absorption. In daylight the apparatus can be used with a hood-like light tight attachment. Wiedersheim improvised an adaptometer out of a stovepipe blackened inside and outside; the pipe was 1 meter long, its diameter 10cm.; at one end was placed a cover containing a transparent ring of 5em. and 4 mm. thickness which served as the test object. The light of a pocket battery, diffused through paper, could be introduced through the open end of the pipe, and its distance from the test object varied. The statem...


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Product Details
  • ISBN-13: 9781130791587
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 254
  • Series Title: English
  • Weight: 458 gr
  • ISBN-10: 1130791580
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 13 mm
  • Width: 189 mm


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