File:A critical study of the Ledebur method for determining oxygen in iron and steel. (1919) (14784010805).jpg

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Identifier: criticalstudyo1919118cain (find matches)
Title: A critical study of the Ledebur method for determining oxygen in iron and steel.
Year: 1919 (1910s)
Authors: Cain, J.R. Pettijohn, E.
Subjects:
Publisher: National Bureau of Standards
Contributing Library: NIST Research Library
Digitizing Sponsor: NIST Research Library

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removed by opening the jaws of thevise on the milling machine, the excess of oil drained off into asuitable container, the sample poured into a bottle and keptcovered with the transformer oil until ready to be washed freefrom oil. Very fine particles of iron tend to remain suspended inthe used oil, and, because of their minute state of division, theywill oxidize after the oil has stood for some time; hence it is notadvisable to use the oil repeatedly unless it is filtered through asand column or otherwise freed from this contamination. The chips are washed free from oil by transferring them to aglass-stoppered bottle, and covering them with benzene. Aftershaking, the benzene is decanted off and a fresh portion added.After six washings, the benzene shows no discoloration from oil.The chips are then thrown on a Buchner funnel and washed threetimes with pure benzene, suction being applied, and the excessliquid removed, after each addition. 22 Technologic Papers of the Bureau of Standards
Text Appearing After Image:
Method for Determining Oxygen 23 4. DRYING AND PRESERVATION OF CHIPS The final operation of preparing a sample for analysis is carriedout in the apparatus shown in Fig. 6, and consists in fitting coverO to 01 and drying the sample by sucking dry air throughit. The air passed through a plug of cotton, F, then suc-cessively through alkaline permanganate, E, concentratedsulphuric acid, D, phosphorus pentoxide, C (right limb),and a short column of reduced steel, C (left limb). Fig. 7shows another form of apparatus which was used for dry-,ing many of our samples after they had been washed asjtjg 7 described. The used benzene can, of course, be recoveredDrying by distillation. tube Experiments with ether and gasolene as washing agentswere unsuccesful, owing to large blanks introduced into the analysisby their use. These may be due to the retention on the chips ofnonvolatile organic impurities containing oxygen. It is abso-lutely necessary that dry air be used in aspirating, otherwise fiieco

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https://www.flickr.com/photos/internetarchivebookimages/14784010805/

Author Cain, J.R.; Pettijohn, E.
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
InfoField
1919
Flickr tags
InfoField
  • bookid:criticalstudyo1919118cain
  • bookyear:1919
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Cain__J_R_
  • bookauthor:_Pettijohn__E_
  • bookpublisher:National_Bureau_of_Standards
  • bookcontributor:NIST_Research_Library
  • booksponsor:NIST_Research_Library
  • bookleafnumber:23
  • bookcollection:NBSTechnologicPapers
  • bookcollection:NISTresearchlibrary
  • bookcollection:fedlink
  • bookcollection:americana
Flickr posted date
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30 July 2014
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