File:Journal of radiology (1921) (14755747184).jpg

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Identifier: journalofradiolo2192radi (find matches)
Title: Journal of radiology
Year: 1921 (1920s)
Authors: Radiological Society of North America American College of Radiology and Physiotherapy
Subjects:
Publisher: Omaha, Neb., : (Radiological Pub. Co.)
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

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ous voltages and the selective reaction of thephotographic plate to the varying wave lengths of rays. There is undoubtedly considerable drawback to using thelonger wave lengths in practical roentgenology, due to thegreat increase of exposure necessary. Approximately ex-posure changes inversely as the square of the voltage. Notonly this factor of exposure increase, but the additionalfactor of care necessary in computing the change, must betaken into account in deciding on the value of an exposuretechnique involving using a short spark gap. In conclusion, we might point out that investigation isnow under way to study quantitatively the effect of scat-tered radiation, for, as we all know, this is of considerableimportance. We hope to present some of the results of certain investi-gations at some later time. It is to be regretted that it is impossible to render in thehalf-tone illustrations the total scales of densities in theoriginal negatives. PHOTOGRAPHIC PHYSICS — HODGSON-MARTIN 4!)
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5 Minutes 20 Minutes DEVELOPMENTFig. 2 VOL. II—4 50 THE JOURNAL OF RADIOLOGY

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https://www.flickr.com/photos/internetarchivebookimages/14755747184/

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Volume
InfoField
1921
Flickr tags
InfoField
  • bookid:journalofradiolo2192radi
  • bookyear:1921
  • bookdecade:1920
  • bookcentury:1900
  • bookauthor:Radiological_Society_of_North_America
  • bookauthor:American_College_of_Radiology_and_Physiotherapy
  • bookpublisher:Omaha__Neb______Radiological_Pub__Co__
  • bookcontributor:The_College_of_Physicians_of_Philadelphia_Historical_Medical_Library
  • booksponsor:The_College_of_Physicians_of_Philadelphia_and_the_National_Endowment_for_the_Humanities
  • bookleafnumber:70
  • bookcollection:medicalheritagelibrary
  • bookcollection:collegeofphysiciansofphiladelphia
  • bookcollection:americana
Flickr posted date
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27 July 2014

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