摘要:

The electrostatic voltmeter described in this paper consists, from an electrical standpoint, of two meters which may be used in series or in parallel. Mechanically, however, it is essentially a single meter, since it contains only one moving part. With the parallel connection voltages between 15 and 100 kv may be measured to within .1 of 1%. With the series connection and voltages between 100 and 200 kv (one‐half on either side of ground, the halves fairly well balanced) the error need not exceed .1 of 1%.

ISSN:0034-6748    

DOI:10.1063/1.1748648

出版商:AIP    

年代:1930

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748649

出版商:AIP    

年代:1930

数据来源: AIP

摘要:

Previous formulas for the design of radiation thermopiles to be used with a Thomson galvanometer are summarized and new formulas for the design of thermopiles for use with D'Arsonval galvanometers are developed.A design of thermopile is described in which the cold junctions almost entirely surround the hot junctions thus reducing drifts. In this design, each element is constructed as a separate unit and when all are completed they are simply stacked up and fastened together with one screw, thereby minimizing the danger of breakage. The whole thermopile fits into a cubical evacuated case only 10 mm on an edge and, being so small, it can be used directly in front of an elliptical mirror which forms a small hot image, in some cases increasing the deflection due to a given radiation by a factor of 3. By a slight modification of the spectrometer, a thermopile having adjustable compensation can be utilized which, theoretically, will give almost no drifts due to changes in temperature of the optical parts of the spectrometer or of the surroundings.A convenient technique of construction is described.

ISSN:0034-6748    

DOI:10.1063/1.1748650

出版商:AIP    

年代:1930

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748651

出版商:AIP    

年代:1930

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748652

出版商:AIP    

年代:1930

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748653

出版商:AIP    

年代:1930

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748654

出版商:AIP    

年代:1930

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748655

出版商:AIP    

年代:1930

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748656

出版商:AIP    

年代:1930

数据来源: AIP

摘要:

Satisfactory high resistances have been made by sputtering platinum on soft glass rods and embedding the rods in paraffin in glass tubes for protection. These resistances are useful for measuring small currents in conjunction with an electrometer, by the resistance shunt method. When properly prepared, sputtered resistors are found to change but slowly with age (tests lasted over 15 months), thus overcoming the principal defect of sputtered metal resistors. They fulfill the following requirements excellently: no trace of polarization, a negligible temperature coefficient, and Ohm's Law is obeyed.

ISSN:0034-6748    

DOI:10.1063/1.1748657

出版商:AIP    

年代:1930

数据来源: AIP