摘要:

A new high vacuum pumping system is described in which oil*is used in a diffusion type pump, and a trap containing activated cocoanut charcoal replaces the usual liquid air trap. The system is capable of attaining a pressure of 2×10−8mm Hg. A high degree of vacuum can be attained at least as quickly as with a mercury diffusion pump and liquid air trap. The system is especially adapted to maintaining a low pressure for several days in apparatus which cannot conveniently be sealed off from the pumps.

ISSN:0034-6748    

DOI:10.1063/1.1748752

出版商:AIP    

年代:1931

数据来源: AIP

摘要:

M. Eppley,1studying the relation between the degree of saturation and the emf, and the temperature coefficient of emf on acid unsaturated standard cells acidified to 0.012 mol per litre of sulphuric acid, has concluded that the acid unsaturated cells with cadmium sulphate concentration of 42.93 percent have negligible temperature coefficients between 15° and 35°C, and that the solutions of these cells might have been saturated at about 4°C.The present authors2measured, in the first place, the solubility of cadmium sulphate into dilute sulphuric acid at different concentrations, and based on the obtained results, with electrolytes of various concentrations from dilute to nearly saturated solutions of cadmium sulphate. They attempted to find out the optimum concentration of cadmium sulphate and acidity of electrolyte, estimated from every point of view, and concluded that cells of concentration of cadmium sulphate 43.0 percent and of acidity 0.05N are most suitable.

ISSN:0034-6748    

DOI:10.1063/1.1748753

出版商:AIP    

年代:1931

数据来源: AIP

摘要:

The termspower sensitivityandvoltage sensitivityare defined for photoelectric elements in a circuit, and a mathematical expression is derived to evaluate each of these characteristics for the three classes of light‐sensitive devices. Curves are plotted for comparing the outputs with one another for various intensities of light flux.

ISSN:0034-6748    

DOI:10.1063/1.1748754

出版商:AIP    

年代:1931

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748755

出版商:AIP    

年代:1931

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748756

出版商:AIP    

年代:1931

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748757

出版商:AIP    

年代:1931

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748758

出版商:AIP    

年代:1931

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748759

出版商:AIP    

年代:1931

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748760

出版商:AIP    

年代:1931

数据来源: AIP