Rontgen Rays; Memoirs by Rontgen, Stokes, and J. J. Thomson

Rontgen Rays; Memoirs by Rontgen, Stokes, and J. J. Thomson

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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. 1898 edition. Excerpt: ...of barium platino-cyanide accompanying it. How very transparent to the X-rays from tubes of average hardness the sensitive film of the photographic plate is is shown by an experiment with 90 "films " laid one over another, 25 centimetres distant from the source of radiation, exposed for 5 minutes, and protected against the radiation of the air by an envelope of lead. Even on the last one a photographic action can be. recognized plainly, while the first is scarcely over-exposed. Induced by this and similar observations, I have inquired of several firms who furnish photographic plates whether it would not be possible to prepare plates which were more suited for photography with X-rays than the ordinary ones. The samples forwarded were not, however, serviceable. I have had many opportunities, as mentioned already on p. 31, to perceive that very hard tubes, under otherwise equal circumstances, require a longer time of exposure than those moderately hard; this is easily understood if we remember the result communicated in 9, according to which all bodies so far examined are more transparent for rays which are emitted by hard tubes than for those coming from soft ones. The fact that with very soft tubes the exposure must again be long is explained by the lack of intensity of the rays emitted by them. If the intensity of the rays is increased by increasing the primary current (see p. 31), the photographic action is increased in the same degree as the intensity of the fluorescence; and in this case, as also in that mentioned above where the intensity of the radiation on the fluorescent screen is altered by changing the distance of the screen from the source of the rays, the brightness of the fluorescence is proportional, or at least nearly so, to...show more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123667135X
  • 9781236671356