摘要:

A method for the photometry of photographic flash lamps with a cathode‐ray oscilloscope is described. The circuits required to obtain curves of luminous fluxversustime on the oscilloscope are given. Accurate timing is obtained through the use of beam modulation. Some of the precautions necessary to assure accuracy are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1770324

出版商:AIP    

年代:1945

数据来源: AIP

摘要:

Two beams from an infra‐red source are focused on opposing thermocouples which are connected in series to a galvanometer. Rocksalt cells containing identical compoundsAare placed in each beam, and the galvanometer is set to zero by a shunt resistance across one of the thermocouples. Then if the composition in one cell is changed by addition of another compoundB,a galvanometer deflection is observed, if the integral of transmission times radiation curve is different for pureAand for mixtures ofAandB.Several examples are given, showing galvanometer current as a function of composition from pureAto pureBin the second cell, while pureAis kept in the first cell. The device thus permits a simple analytical method for two component systems.

ISSN:0034-6748    

DOI:10.1063/1.1770325

出版商:AIP    

年代:1945

数据来源: AIP

摘要:

Small leaks in vacuum systems may be found by observing the change in temperature‐limited thermionic emission of a tungsten filament in the vacuum as oxygen is blown over the leak. An apparatus is described for regulating the filament heating power so that the emission is not affected by line voltage fluctuations. The apparatus also operates as an ionization gauge with emission control.

ISSN:0034-6748    

DOI:10.1063/1.1770326

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770328

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770329

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770330

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770331

出版商:AIP    

年代:1945

数据来源: AIP