A description is given of a simple two-stage resistance-coupled vacuum-tube amplifier for use in measuring ionization currents down to the order of 10~ 13 ampere. Commercial dry-cell vacuum tubes are used. It can be calibrated and will retain its calibration over considerable periods within 1 percent. Where comparative measurements are required—for example, standardizing radium preparations—it is capable of a much higher accuracy. Readings are made on a pointer-type microammeter. The stability of the circuit indicates that a more sensitive instrument could be used if more feeble currents are to be measured. A description of interchangeable ionization chambers, suitable for use with such an amplifier, is given.
{"title":"A resistance-coupled amplifier for measuring ionization currents","authors":"L. F. Curtiss","doi":"10.6028/JRES.010.041","DOIUrl":"https://doi.org/10.6028/JRES.010.041","url":null,"abstract":"A description is given of a simple two-stage resistance-coupled vacuum-tube amplifier for use in measuring ionization currents down to the order of 10~ 13 ampere. Commercial dry-cell vacuum tubes are used. It can be calibrated and will retain its calibration over considerable periods within 1 percent. Where comparative measurements are required—for example, standardizing radium preparations—it is capable of a much higher accuracy. Readings are made on a pointer-type microammeter. The stability of the circuit indicates that a more sensitive instrument could be used if more feeble currents are to be measured. A description of interchangeable ionization chambers, suitable for use with such an amplifier, is given.","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"583"},"PeriodicalIF":0.0,"publicationDate":"1933-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341243","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":"A method of exciting resonant vibrations in mechanical systems","authors":"L. Tuckerman, H. L. Dryden, H. Brooks","doi":"10.6028/JRES.010.047","DOIUrl":"https://doi.org/10.6028/JRES.010.047","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"659"},"PeriodicalIF":0.0,"publicationDate":"1933-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341343","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":"Conditions affecting the freezing temperature of silver","authors":"W. F. Roeser, A. I. Dahl","doi":"10.6028/JRES.010.048","DOIUrl":"https://doi.org/10.6028/JRES.010.048","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"661"},"PeriodicalIF":0.0,"publicationDate":"1933-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341352","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":"Critical solution temperatures of mixtures of gasoline, ethyl alcohol, and water","authors":"O. Bridgeman, D. Querfeld","doi":"10.6028/JRES.010.051","DOIUrl":"https://doi.org/10.6028/JRES.010.051","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"693"},"PeriodicalIF":0.0,"publicationDate":"1933-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341420","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 flexometer, an instrument for evaluating the flexural properties of cloth and similar materials","authors":"H. F. Schiefer","doi":"10.6028/JRES.010.046","DOIUrl":"https://doi.org/10.6028/JRES.010.046","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"647"},"PeriodicalIF":0.0,"publicationDate":"1933-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341457","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":"Isolation of ethylbenzene from an Oklahoma petroleum","authors":"J. D. White, F. Rose","doi":"10.6028/JRES.010.045","DOIUrl":"https://doi.org/10.6028/JRES.010.045","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"639"},"PeriodicalIF":0.0,"publicationDate":"1933-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341253","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 determination of stresses from strains on three intersecting gage lines and its application to actual tests","authors":"W. Osgood, R. G. Sturm","doi":"10.6028/JRES.010.050","DOIUrl":"https://doi.org/10.6028/JRES.010.050","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"685"},"PeriodicalIF":0.0,"publicationDate":"1933-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341411","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":"Wind pressure on a model of the Empire State Building","authors":"H. L. Dryden, G. C. Hill","doi":"10.6028/JRES.010.036","DOIUrl":"https://doi.org/10.6028/JRES.010.036","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"493"},"PeriodicalIF":0.0,"publicationDate":"1933-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341191","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}
Description of an apparatus suitable for general magnetic testing in the range of values of magnetizing force from 100 to 1,000 oersteds. Specimens of rectangular cross-section from one-half inch (1.27 cm) to 1% inches (3.8 cm) in width and any thickness up to three-fourths inch (1.9 cm) can he tested with an accuracy estimated to be within 2 per cent. The apparatus is convenient and simple to operate, and does not heat the specimen. CONTENTS Page
{"title":"An apparatus for magnetic testing at high magnetizing forces","authors":"R. L. Sanford, E. G. Bennett","doi":"10.6028/JRES.010.039","DOIUrl":"https://doi.org/10.6028/JRES.010.039","url":null,"abstract":"Description of an apparatus suitable for general magnetic testing in the range of values of magnetizing force from 100 to 1,000 oersteds. Specimens of rectangular cross-section from one-half inch (1.27 cm) to 1% inches (3.8 cm) in width and any thickness up to three-fourths inch (1.9 cm) can he tested with an accuracy estimated to be within 2 per cent. The apparatus is convenient and simple to operate, and does not heat the specimen. CONTENTS Page","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"567"},"PeriodicalIF":0.0,"publicationDate":"1933-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341230","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 combination of silk and wool with positive and negative ions","authors":"M. Harris","doi":"10.6028/JRES.010.034","DOIUrl":"https://doi.org/10.6028/JRES.010.034","url":null,"abstract":"","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"10 1","pages":"475"},"PeriodicalIF":0.0,"publicationDate":"1933-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341183","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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