ISSN:0034-6748    

DOI:10.1063/1.1751829

出版商:AIP    

年代:1934

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751830

出版商:AIP    

年代:1934

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751831

出版商:AIP    

年代:1934

数据来源: AIP

摘要:

A circuit is described which has for its purpose the determination of the direction of rotation of the fluorescent spot obtained in current‐voltage oscillograms. The figure described by the rotating spot is interrupted at a suitable point in the cycle by means of a neon lamp discharge, and examination of this interrupted figure readily leads to the correct conclusion as to the direction of rotation which prevailed in the original figure.

ISSN:0034-6748    

DOI:10.1063/1.1751832

出版商:AIP    

年代:1934

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751833

出版商:AIP    

年代:1934

数据来源: AIP

摘要:

A two meter focus, normal incidence, vacuum spectrograph is described which covers on one plate the whole range from the zero order up to the first order of &lgr;2500. The 30,000 line per inch glass grating gives a dispersion of about 4.27A per mm and strong spectra are obtained to as short wave‐lengths as &lgr;300, with lines a little below &lgr;200 showing on long exposures. The body of the spectrograph is exhausted by an Aristovac pump to a pressure of 2×10−5mm, a vacuum guard ring device of double rubber gaskets being used to seal the end covers. The instrument is particularly suitable for the establishment of short wave‐length standards and for the study of line and band spectra from gas discharges and the study of absorption spectra in gases. The limitations of the instrument are discussed and suggestions are given, based on several years' experience with this instrument, for a spectrograph of new design which would avoid most of the difficulties inherent in this general type of vacuum spectrograph.

ISSN:0034-6748    

DOI:10.1063/1.1751834

出版商:AIP    

年代:1934

数据来源: AIP

摘要:

The paper embodies the description of a polariscope which offers several advantages for photoelastic investigations and is applicable to the analysis of stress distributions in parallel plates and to Mesnager's modified three‐dimensional analysis. The chief characteristic of the optical arrangement is that the light, after passing through the usual arrangement of polarizing prism, retardation plate and model, is reflected directly back through the same system.

ISSN:0034-6748    

DOI:10.1063/1.1751835

出版商:AIP    

年代:1934

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751836

出版商:AIP    

年代:1934

数据来源: AIP