{"title":"The latent heat of pressure variation of liquid ammonia","authors":"N. S. Osborne, M. V. Dusen","doi":"10.6028/bulletin.342","DOIUrl":"https://doi.org/10.6028/bulletin.342","url":null,"abstract":"When a fluid undergoes a change of pressure, there occurs a transtormation of energy into heat or vice versa, which results in a change of temperature of the substance unless a like amount of heat is abstracted or added. This change expressed as the heat so transformed per imit change of pressure will be called \"latent heat of pressure variation.\" For most liquids under usual conditions of temperature and pressure this quantity, which depends on the thermal expansivity, is small compared with the other quantities of heat which are usually observed, but for liquid ammonia in the range —40 to +40° C and corresponding saturated vapor pressures it is sufficiently large to be taken into account in calorimetric determinations of specific heat; and, in consequence, the measurements here described were made as a supj^lement to a series of such determinations in order to correlate measurements of specific heat of liquid ammonia ^ made at constant pressure with others made under saturation conditions.","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1918-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125109630","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":"Gas interferometer calibration","authors":"J. D. Edwards","doi":"10.6028/bulletin.344","DOIUrl":"https://doi.org/10.6028/bulletin.344","url":null,"abstract":"The Rayleigh-Zeiss gas interferometer has found numerous applications in high-precision gas analysis. However, it requires preliminary calibration, and its accuracy is limited by the accuracy of the calibration, even though the precision of reading be considerably greater. This interferometer and its uses have been described in detail by Haber and Lowe, 1 L. Stuckert, L,. H. Adams, 3 and others. This type of gas interferometer measures the difference in refractivity of two samples of gas contained in two gas chambers which, in the laboratory type of apparatus, are ioo cm long. Light from an illuminated slit passes through both chambers, after which the two beams combine to produce interference fringes which are observed through an eyepiece. The optical path of the two beams can be brought to equality by tilting a glass compensator plate which is placed in the path of one of the beams. If the temperature, pressure, or composition of the gas in one of the chambers is changed, the optical paths are","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1918-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115156658","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":"Resonance and ionisation potentials for electrons in cadmium vapor","authors":"J. Tate, P. D. Foote","doi":"10.6028/BULLETIN.345","DOIUrl":"https://doi.org/10.6028/BULLETIN.345","url":null,"abstract":"The phenomena connected with the passage of electrons through mercury vapor have been fairly completely investigated. Franck and Hertz ^ have shown that when the velocity of the electrons is less than that attained in falling through 4.9 volts there is no loss of energy at impact with a mercury atom. After falling through a difference in potential of 4.9 volts, however, the electrons are capable of transferring all of their kinetic energy to the mercury atom. The energy absorbed by the atom under these conditions is emitted as radiant energy of the single wave length, X = 2536.72A. It was at first thought that this radiation of light was the result of a recombination with the atom of an electron which had been removed from it by the energy of impact. That","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1918-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127624608","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":"Specific heat of liquid ammonia","authors":"N. S. Osborne, M. V. Dusen","doi":"10.6028/BULLETIN.341","DOIUrl":"https://doi.org/10.6028/BULLETIN.341","url":null,"abstract":"","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1918-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115475039","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 for testing current transformers","authors":"F. B. Silsbee","doi":"10.6028/BULLETIN.337","DOIUrl":"https://doi.org/10.6028/BULLETIN.337","url":null,"abstract":"Several precise laboratory methods are now available for the determination of the ratio and phase angle of current transformers. 1 These, however, all require a considerable amount of special apparatus, such as carefully calibrated noninductive shunts and very sensitive alternating-current detectors, and are therefore not suited for use under shop or central-station conditions. The task of comparing the constants of one transformer with those of a second transformer taken as a standard is much less","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"55 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1918-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114136134","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":"Calculation of Planck's constant C(sub)2","authors":"J. Dellinger","doi":"10.6028/BULLETIN.313","DOIUrl":"https://doi.org/10.6028/BULLETIN.313","url":null,"abstract":"","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1917-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128513707","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":"Freezing point of mercury","authors":"R. Wilhelm","doi":"10.6028/BULLETIN.320","DOIUrl":"https://doi.org/10.6028/BULLETIN.320","url":null,"abstract":"","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1917-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114899493","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":"Illumination from a radiating disc","authors":"P. D. Foote","doi":"10.6028/BULLETIN.287","DOIUrl":"https://doi.org/10.6028/BULLETIN.287","url":null,"abstract":"","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1916-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114056563","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":"Note on the resistance of radiotelegraphic antennas","authors":"L. Austin","doi":"10.6028/BULLETIN.281","DOIUrl":"https://doi.org/10.6028/BULLETIN.281","url":null,"abstract":"","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1916-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116043171","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":"Interference measurements of wave lengths in the iron spectrum (2851-3701) with notes on comparisons of lengths of light waves by interference methods, and some wave lengths in the spectrum of neon gas","authors":"K. Burns, W. Meggers","doi":"10.6028/BULLETIN.275","DOIUrl":"https://doi.org/10.6028/BULLETIN.275","url":null,"abstract":"","PeriodicalId":227231,"journal":{"name":"Bulletin of the Bureau of Standards","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1915-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114922111","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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