Bureau of Standards Journal of Research最新文献

{"title":"Thermal conductivity of some irons and steels over the temperature range 100 to 500 C","authors":"S. M. Shelton","doi":"10.6028/JRES.012.042","DOIUrl":"https://doi.org/10.6028/JRES.012.042","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"441"},"PeriodicalIF":0.0,"publicationDate":"1934-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Some optical and crystallographical properties of the alkali zinc uranyl acetates","authors":"H. Insley, F. Glaze","doi":"10.6028/JRES.012.045","DOIUrl":"https://doi.org/10.6028/JRES.012.045","url":null,"abstract":"The optical properties and crystal form of the zinc uranyl acetates of sodium, lithium, and potassium were determined. The lithium and sodium zinc uranyl acetates belong to the monoclinic system and are isomorphous. They are capable of forming a series of solid solutions, as is evidenced by the homogeneity and the intermediate optical properties and X-ray pattern of a mixed sodium and lithium zinc uranyl acetate. The potassium zinc uranyl acetate belongs to the tetragonal system and differs from the lithium and sodium zinc uranyl acetates in optical properties and crystal form. In studying the application of the Barber and Kolthoff method l for the quantitative determination of sodium to the analysis of glass, 2 a casual examination of the crystalline precipitate showed that the crystals were, in general, very well formed and were characterized by twinning. Barber and Kolthoff stated that part of the potassium and most of the lithium are precipitated with the sodium salt when they are present. Glaze has recently substantiated Barber and Kolthoff's statement that lithium cannot be separated from sodium, but has shown that potassium can be separated from sodium if proper precautions are taken. 3 Hence it seemed desirable to make a detailed study of the three salts to see if they can be readily distinguished by their optical properties. The crystalline compounds used in this work were prepared as follows: One volume of a solution of cp alkali chloride was mixed with 10 volumes of the zinc uranyl acetate reagent 4 and stirred frequently during 30 minutes. The precipitate was filtered and washed free from the excess reagent with 95 percent alcohol and finally with etber. The precipitate was dissolved in a minimum amount of distilled water and recrystallized by slowly concentrating the solution in a dessicator over sulphuric acid. In the case of the potassium salt a few drops of acetic acid were added to prevent hydrolysis. Microscopic examination of the sodium and lithium salts showed them to be perfectly homogeneous and without visible impurity. Analyses of these two salts were made as follows: The uranium was converted to sulphate by fuming with sulphuric acid, reduced in a Jones reductor, oxidized to quadrivalent uranium with air and i Jour. Am. Chem. Soc, vol. 50, pp. 1625-1631, 1928. « F. W. Glaze, Jour Am. Cer. Soc, vol. 14, no. 6, pp. 450-453, 1931. 3 B.S. Technical News Bulletin No. 94, p. 68, June 1933. * Barber and Kolthofi, op. cit., p. 1626. 471 472 Bureau oj Standards Journal of Research [Vol. IB titrated with permanganate. The zinc was precipitated from a 0.008 N sulphuric acid solution by hydrogen sulphide. The precipitate was dissolved and reprecipitated until white in color, filtered, and ignited to the oxide. The alkali was determined as sulphate on a separate sample after removing the uranium and zinc as sulphides from an ammoniacal solution. On the lithium salt water was determined at 100 C and 3 mm pressure and the acetic acid was","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"471"},"PeriodicalIF":0.0,"publicationDate":"1934-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative performance of watches with elinvar and with steel hairsprings","authors":"R. E. Gould","doi":"10.6028/jres.012.043","DOIUrl":"https://doi.org/10.6028/jres.012.043","url":null,"abstract":"The performance of watches having the usual cut, bimetallic balance wheels and steel hairsprings is compared with that of watches having uncut, monometallic balance wheels and elinvar hairsprings. The latter combination of vibrating assembly is a new application intended to improve the general performance of watches. Twenty watches of each type, 10 each of 2 makes, were given performance tests at temperatures encountered in ordinary use. The temperature-rate errors of the watches having the new vibrating assembly were less than those for watches having the ordinary assembly, and instead of the usual parabolic curve, a curve approaching a straight line was obtained. Marked improvement in performance at temperatures within the usual temperature range 5 to 35 C is indicated by the use of the new assembly. The new assembly almost entirely overcomes the effects of magnetism so that, after the watch is removed from a magnetic field, the rate is not subject to fluctuations experienced with the ordinary assembly. There is no evidence of any marked difference in performance of the two types of watches in different positions or for isochronism. CONTENTS Page","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"451"},"PeriodicalIF":0.0,"publicationDate":"1934-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First spectrum of tantalum","authors":"C. C. Kiess, E. Z. Stowell","doi":"10.6028/JRES.012.044","DOIUrl":"https://doi.org/10.6028/JRES.012.044","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"459"},"PeriodicalIF":0.0,"publicationDate":"1934-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The carbonization process: A study of the system wool--sulphuric-acid--water","authors":"M. Harris","doi":"10.6028/JRES.012.046","DOIUrl":"https://doi.org/10.6028/JRES.012.046","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"475"},"PeriodicalIF":0.0,"publicationDate":"1934-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Apparatus for measuring thermal conductivity of metals up to 600 C","authors":"M. V. Dusen, S. M. Shelton","doi":"10.6028/JRES.012.041","DOIUrl":"https://doi.org/10.6028/JRES.012.041","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"429"},"PeriodicalIF":0.0,"publicationDate":"1934-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compression cutting test for rubber","authors":"W. Holt","doi":"10.6028/JRES.012.047","DOIUrl":"https://doi.org/10.6028/JRES.012.047","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"489"},"PeriodicalIF":0.0,"publicationDate":"1934-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal expansions of some soda-lime-silica glasses as functions of the composition","authors":"B. C. Schmid, A. N. Finn, J. Young","doi":"10.6028/JRES.012.040","DOIUrl":"https://doi.org/10.6028/JRES.012.040","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"421"},"PeriodicalIF":0.0,"publicationDate":"1934-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinetics of reaction between silver bromide and photographic sensitizers","authors":"B. H. Carroll, D. Hubbard","doi":"10.6028/JRES.012.032","DOIUrl":"https://doi.org/10.6028/JRES.012.032","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"329"},"PeriodicalIF":0.0,"publicationDate":"1934-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reproducibility of the ice point","authors":"J. L. Thomas","doi":"10.6028/JRES.012.031","DOIUrl":"https://doi.org/10.6028/JRES.012.031","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"12 1","pages":"323"},"PeriodicalIF":0.0,"publicationDate":"1934-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71342192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}