摘要:

A description is given of a simple and efficient baffle system which results in a vapor trap of high conductance for permanent gas. Two methods for maintaining the temperature of the trap in the range −50° to −80°C are described, one designed for intermittent and one for continuous operation. Measured conductances and over‐all performance characteristics are given.

ISSN:0034-6748    

DOI:10.1063/1.1751686

出版商:AIP    

年代:1940

数据来源: AIP

摘要:

A rugged, simple, and inexpensive circuit is described which enables one to ascertain rapidly the power factor and capacitance of condensers. With minor changes the circuit can be used to determine the magnitude and angle of any impedance.

ISSN:0034-6748    

DOI:10.1063/1.1751687

出版商:AIP    

年代:1940

数据来源: AIP

摘要:

A mass spectrometer suitable for routine isotope analyses of carbon, nitrogen, and other light elements which may be put in the gaseous or vapor form is described. Although a simple, relatively inexpensive magnet consuming little power is used, good resolution is obtained.

ISSN:0034-6748    

DOI:10.1063/1.1751688

出版商:AIP    

年代:1940

数据来源: AIP

摘要:

The Kelvin double bridge for measuring low resistances usually is balanced by either variable ratio arms or by a variable standard resistor. For the calibration of fixed value standard resistors when the major ratio arms and the bridge standard are fixed value precision standards, Work's method obtains the balance of the bridge by passing an adjustable auxiliary current through the standard.

ISSN:0034-6748    

DOI:10.1063/1.1751689

出版商:AIP    

年代:1940

数据来源: AIP

摘要:

A precision photoelectric spectrophotometer is described which illuminates absorption cells with light which has passed through two monochromators, the half‐intensity width of the spectral region isolated being from 5 to 10 m&mgr;. Cells 20 cm long and as much as 14 cm in diameter may be used when it is necessary to work at low or high temperatures with thermostated equipment. The detector is a null instrument, giving a sensitivity of 0.0001I0and an accuracy under favorable conditions in the optical density of 0.1 percent.

ISSN:0034-6748    

DOI:10.1063/1.1751690

出版商:AIP    

年代:1940

数据来源: AIP

摘要:

Structural and performance data on a Cs&sngbnd;Cs2O&sngbnd;Ag type of photoelectric cell whose current output is amplified by an integral 6‐ or 11‐stage electron multiplier are given.

ISSN:0034-6748    

DOI:10.1063/1.1751691

出版商:AIP    

年代:1940

数据来源: AIP

摘要:

Investigation shows that a straight line relationship exists between the concentration of aqueous colloidal graphite and the minimum temperature at which it will wet unclean, highly polished surfaces of metal. Surfaces cleaned with metallographic powder and water are wetted by this type of dispersion at room temperature.

ISSN:0034-6748    

DOI:10.1063/1.1751692

出版商:AIP    

年代:1940

数据来源: AIP

摘要:

A technique is described for the lining of metal capillaries with a thin coat of glass. The advantages of such capillaries in electrical discharges are pointed out. Use is made of such a capillary in a highly efficient positive ion source for high voltage nuclear research.

ISSN:0034-6748    

DOI:10.1063/1.1751693

出版商:AIP    

年代:1940

数据来源: AIP

摘要:

The serious effect of pressure and temperature variations in the use of a Fabry‐Perot interferometer is outlined, together with a method successfully employed to reduce these variations to a reasonable limit.

ISSN:0034-6748    

DOI:10.1063/1.1751694

出版商:AIP    

年代:1940

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751697

出版商:AIP    

年代:1940

数据来源: AIP