{"title":"The utility of the spark test as applied to commercial steels","authors":"R. Buzzard","doi":"10.6028/JRES.011.035","DOIUrl":"https://doi.org/10.6028/JRES.011.035","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"527"},"PeriodicalIF":0.0,"publicationDate":"1933-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341852","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 system liquid iron-carbon oxides","authors":"H. C. Vacher","doi":"10.6028/JRES.011.036","DOIUrl":"https://doi.org/10.6028/JRES.011.036","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"541"},"PeriodicalIF":0.0,"publicationDate":"1933-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341863","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":"Simple calorimeter for heats of fusion. Data on the fusion of pseudocumene, mesitylene (alpha and beta), hemimellitene, o- and m-xylene, and on two transitions of hemimellitene","authors":"D. Rossini","doi":"10.6028/JRES.011.037","DOIUrl":"https://doi.org/10.6028/JRES.011.037","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"553"},"PeriodicalIF":0.0,"publicationDate":"1933-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341875","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 deposition of chromium from solutions of chromic and chromous salts","authors":"C. Kasper","doi":"10.6028/JRES.011.034","DOIUrl":"https://doi.org/10.6028/JRES.011.034","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"515"},"PeriodicalIF":0.0,"publicationDate":"1933-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341841","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":"Tests of theatre-proscenium curtains","authors":"N. Mitchell","doi":"10.6028/JRES.011.033","DOIUrl":"https://doi.org/10.6028/JRES.011.033","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"116 1","pages":"491"},"PeriodicalIF":0.0,"publicationDate":"1933-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341990","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}
In a study of several photographic developers, including the international sensitometric standard, p-aminophenol, it was found that the latter agent is not as satisfactory as certain metol-hydroquinone developers in two respects: (1) The "toe" region of the characteristic curve is increased, accompanied by an increased inertia; and (2) the recommended formula is not well chosen in that the solution is supersaturated. It is also found that the presence of soluble bromide in some developers gives, with some emulsions at least, an increased sensitivity with prolonged development. This effect should prove useful in those cases where high contrast is not detrimental. It was observed that, in general, the ratio of values of the two sensitivity indices varied considerably with development time. In fact, under certain conditions, values of one index {IIi) may be decreasing while values of the other 0-1Em) are increasing with development time. In order to consider these apparently contradictory changes a definition for relative sensitivity has been set up. From this definition it follows that comparisons of sensitivity may be made only when the emulsions have each received equivalent development. The type of emulsion with which each of these indices is particularly applicable is also indicated. The findings of Luther, that the gradient of the curve above the inertia point is approximately one half y, are confirmed. The application of this constant to coordinate the inertia and gradient methods of specifying sensitivity is discussed. This information should help clear up the confusion surrounding the measurement of the sensitivity of photographic emulsions. CONTENTS Page
{"title":"A comparison of several developers and the specification of relative sensitivity","authors":"R. Davis, G. K. Neeland","doi":"10.6028/JRES.011.028","DOIUrl":"https://doi.org/10.6028/JRES.011.028","url":null,"abstract":"In a study of several photographic developers, including the international sensitometric standard, p-aminophenol, it was found that the latter agent is not as satisfactory as certain metol-hydroquinone developers in two respects: (1) The \"toe\" region of the characteristic curve is increased, accompanied by an increased inertia; and (2) the recommended formula is not well chosen in that the solution is supersaturated. It is also found that the presence of soluble bromide in some developers gives, with some emulsions at least, an increased sensitivity with prolonged development. This effect should prove useful in those cases where high contrast is not detrimental. It was observed that, in general, the ratio of values of the two sensitivity indices varied considerably with development time. In fact, under certain conditions, values of one index {IIi) may be decreasing while values of the other 0-1Em) are increasing with development time. In order to consider these apparently contradictory changes a definition for relative sensitivity has been set up. From this definition it follows that comparisons of sensitivity may be made only when the emulsions have each received equivalent development. The type of emulsion with which each of these indices is particularly applicable is also indicated. The findings of Luther, that the gradient of the curve above the inertia point is approximately one half y, are confirmed. The application of this constant to coordinate the inertia and gradient methods of specifying sensitivity is discussed. This information should help clear up the confusion surrounding the measurement of the sensitivity of photographic emulsions. CONTENTS Page","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"379"},"PeriodicalIF":0.0,"publicationDate":"1933-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341975","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":"Comparison of high voltage -xray tubes","authors":"L. Taylor, G. Singer, C. Stoneburner","doi":"10.6028/JRES.011.025","DOIUrl":"https://doi.org/10.6028/JRES.011.025","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"341"},"PeriodicalIF":0.0,"publicationDate":"1933-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341966","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}
The second spectrum of krypton (Kr n) characteristic of once ionized krypton atoms (Kr+) has been selected from various krypton spectra excited in Geissler tubes by noting intensity changes accompanying variations of capacity and inductance in the electrical circuit. This description and analysis of the Kr n spectrum includes estimates of relative intensities and wave-length measurements for 1,050 lines extending from 2,080.53 A in the ultraviolet to 10,659.5 A in the infrared. Most of these lines (71 percent) have been classified as combinations of 128 energy levels, 112 of which have been more or less definitely identified with quantum numbers and electron configurations. Zeeman effects are quoted for 102 lines. In addition, 51 lines in the extreme ultraviolet (575.92 to 964.93 A) are classified as transitions from excited states to the normal ones. The sp electron configuration of the normal Kr+ ion is represented by a doublet P term with level separation 5,371 cm , and the excited states are described by doublet and quartet terms arising from the addition of ns, np, nd, nf electrons to the sp group constituting the outer structure of the doubly charged ion (Kr++). An absolute value of 198,182 cm is derived for the ground level s2p 5 . P§/4, which fixes the ionization potential of Kr+ atoms at approximately 24.4 volts. CONTENTS Page
{"title":"The second spectrum of krypton","authors":"T. deBruin, C. J. Humphreys, W. Meggers","doi":"10.6028/JRES.011.029","DOIUrl":"https://doi.org/10.6028/JRES.011.029","url":null,"abstract":"The second spectrum of krypton (Kr n) characteristic of once ionized krypton atoms (Kr+) has been selected from various krypton spectra excited in Geissler tubes by noting intensity changes accompanying variations of capacity and inductance in the electrical circuit. This description and analysis of the Kr n spectrum includes estimates of relative intensities and wave-length measurements for 1,050 lines extending from 2,080.53 A in the ultraviolet to 10,659.5 A in the infrared. Most of these lines (71 percent) have been classified as combinations of 128 energy levels, 112 of which have been more or less definitely identified with quantum numbers and electron configurations. Zeeman effects are quoted for 102 lines. In addition, 51 lines in the extreme ultraviolet (575.92 to 964.93 A) are classified as transitions from excited states to the normal ones. The sp electron configuration of the normal Kr+ ion is represented by a doublet P term with level separation 5,371 cm , and the excited states are described by doublet and quartet terms arising from the addition of ns, np, nd, nf electrons to the sp group constituting the outer structure of the doubly charged ion (Kr++). An absolute value of 198,182 cm is derived for the ground level s2p 5 . P§/4, which fixes the ionization potential of Kr+ atoms at approximately 24.4 volts. CONTENTS Page","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"53 1","pages":"409"},"PeriodicalIF":0.0,"publicationDate":"1933-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341983","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}
Improvements in the reproducibility and constancy of electromotive force (emf) of Weston normal cells have resulted from many previous researches, but little attention has hitherto been given to effects which may be produced by the glass containers. Accelerated experiments have now been made by adding samples of glass in powdered form to the mercurous-sulphate paste and the resulting effects have been found to parallel the behavior of other cells which have been under observation for longer periods of time. Various chemical compounds have also been added to the paste to test their effects on emf of the cells. Some of these materials have caused abnormal hysteresis and temperature coefficients. The glass containers have been redesigned with a view to improving the constancy and portability of the cells. CONTENTS Page
{"title":"Effect of glass containers on the electromotive force of Weston normal cells","authors":"G. W. Vinal, M. L. Howard","doi":"10.6028/JRES.011.018","DOIUrl":"https://doi.org/10.6028/JRES.011.018","url":null,"abstract":"Improvements in the reproducibility and constancy of electromotive force (emf) of Weston normal cells have resulted from many previous researches, but little attention has hitherto been given to effects which may be produced by the glass containers. Accelerated experiments have now been made by adding samples of glass in powdered form to the mercurous-sulphate paste and the resulting effects have been found to parallel the behavior of other cells which have been under observation for longer periods of time. Various chemical compounds have also been added to the paste to test their effects on emf of the cells. Some of these materials have caused abnormal hysteresis and temperature coefficients. The glass containers have been redesigned with a view to improving the constancy and portability of the cells. CONTENTS Page","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"255"},"PeriodicalIF":0.0,"publicationDate":"1933-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341938","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":"Effect of temperature and frequency on the dielectric constant, power factor, and conductivity of compounds of purified rubber and sulphur","authors":"A. Scott, A. T. Mcpherson, H. L. Curtis","doi":"10.6028/JRES.011.015","DOIUrl":"https://doi.org/10.6028/JRES.011.015","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"173"},"PeriodicalIF":0.0,"publicationDate":"1933-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341758","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}
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