File:The American journal of science (1913) (17966822099).jpg

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Title: The American journal of science
Identifier: americanjourna4361913newh (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Science
Publisher: New Haven : J. D. & E. S. Dana
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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216 Wellisch and Woodrow—Columnar Ionization. On the hypothesis of Wellisch and Bronson it was to be ex- pected that r( would be greater than rt for large values of the field ; whereas on the Langevin-Moulin theory ?\ should be less than rt, except when saturation was attained, in which case we should have rx = rt. In order to determine the value of rt corresponding to any value of the field, the ionization currents due to the alpha rays from a polonium source were measured in a longitudinal field for air at one atmosphere and for air at a lower pressure p. The ratio of these currents gives the value of rl and is inde- pendent of the actual number of alpha particles entering the Fig. 1. To Battery ToPump & Gauge
Text Appearing After Image:
measuring apparatus and also of the electrical capacity of the system : in fact it is the ratio which would be obtained for the ionization due to a single alpha particle. The ratio rt was obtained in a similar manner by obtaining the corresponding currents in the transverse field. Description of Apparatus and Experimental Procedure. 3. By the kind permission of Prof. Bumstead we were en- abled to avail ourselves of the ionization vessel which had pre- viously been employed by Wheelock* in his experiments on alpha-ray ionization. A general idea of the apparatus and the general scheme of connections may be obtained from ^. 1. For the vertical longitudinal field the ionization vessel consisted of a wire gauze B, 7'5cm in diameter, situated 4mrn below a cir- * Wheelock, this Journal (4), xxx, p. 233, 1910.

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Volume
InfoField
1913
Flickr tags
InfoField
  • bookid:americanjourna4361913newh
  • bookyear:1880
  • bookdecade:1880
  • bookcentury:1800
  • booksubject:Science
  • bookpublisher:New_Haven_J_D_E_S_Dana
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:242
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
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27 May 2015
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