File:Journal of roentgenology (1919) (14570632050).jpg

Identifier: journalofroentge2191west (find matches)
Title: Journal of roentgenology
Year: 1919 (1910s)
Authors: Western Roentgen Society
Subjects: Radiology
Publisher: Iowa City, Iowa : Western Roentgen Society, 1918-1919
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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glass with a coefficient of0.20 and a piece of rough glass with a coefficient of 0.35have been received. Lead rubber with a coefficient of 0.48has been received. As the protective coefficient increases, both the thicknessand the weight per unit area needed to afford a given pro-tection decrease. In order to ascertain the relation be-tween the protective coefficient and the weight per unitarea required for a given protection, the density of manyof the specimens tested was determined. (Exhibited and discussed slides.) The Bureau of Standards is at the beginning of its x-ray work. It hopes ultimately to include the study and 46 THE JOURNAL OF ROENTGENOLOGY testing of all apparatus and supplies used by x-ray work-ers. To the extent of its facilities the Bureau wishes toserve you—both roentgenologists and manufacturers—inevery legitimate way. The Bureau desires your assis-tance; e. g., you can assist the Bureau (a) by encourag-ing the sale of protective materials on the basis of guar-
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anteed quality, expressed numerically in terms of lead;(h) by bringing to our attention any difficulty you mayhave in obtaining satisfactory materials, and by advisingus of the names of such parties—if there be any—as habi-tually deal in unsatisfactory materials; (c) by bringingto our attention any marked improvement in apparatus orsupplies; (d) by advising us of lines of testing, investiga-tion, or improvement that will be of importance to you; (e)by bringing to our attention your own work bearing uponstandardization or improvement of apparatus, materials,or methods. In short, the Bureau of Standards desires your coopera-tion in securing improved materials, improved apparatus,improved methods and practices, and in combating errorsand misconceptions. DORSEY — X-RAY STANDARDS

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