Kodakery Volume 7

Kodakery Volume 7

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Description

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. 1919 edition. Excerpt: ...had quite forgotten I owned one, really," came the happy reply. Then with her eyes upon the speed dial, my wildly-elated companion issued a peremptory command, PHOTOGRAPHY AND X-RAYS When X-rays were first utilized by Roentgen in 1895, possibly no one would have dared prophecy the wonderful possibilities of this new type of radiation. Yet in the space of twentyfour years, from occupying a place as a scientific curiosity, the rays have become so widespread in use in medical practice, technical processes and scientific research as to make them absolutely indispensable. A good deal of this progress has been brought about by the possibilities opened up through the development of photographic materials. The evolution of the sensitive dry plate or film in this prog ress has been of prime importance. In 1895, an exposure of some five to twenty minutes was required, in average cases, to radiograph a human hand or foot. To-day we can make the same exposure under similar conditions in as many seconds. In 1895, it was impossible to radiograph thick parts of the body. To-day, by taking advantage of the latest photographic methods, we can take an X-ray of the chest, the stomach or the spine in the fraction of a second if it is desired. A short description of the fundamentals of this interesting phase of photography will probably be of interest. X-rays, although invisible to the human eye, are now known to be a form of radiation very similar to our ordinary light, differing from light only in the wave length of the radiating energy. The most striking result of this difference is that X-rays will penetrate materials which are quite opaque to light. This is due to the extremely short wave length of X-rays, for while light waves are about Vfeo.ooo of...show more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236815017
  • 9781236815019