ISSN:0034-6748    

DOI:10.1063/1.1748986

出版商:AIP    

年代:1933

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748987

出版商:AIP    

年代:1933

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748988

出版商:AIP    

年代:1933

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748989

出版商:AIP    

年代:1933

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748990

出版商:AIP    

年代:1933

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1748991

出版商:AIP    

年代:1933

数据来源: AIP

摘要:

A wave‐length comparator has been constructed, in which the microscope moves along the direction of the measuring screw and the platform carrying the photographic plate has an independent motion at right angles to the direction of the screw. A split nut which is part of the microscope carriage permits release from the screw and a quick motion of the microscope from one end of the photographic plate to the other.

ISSN:0034-6748    

DOI:10.1063/1.1748992

出版商:AIP    

年代:1933

数据来源: AIP

摘要:

The sensitivity of d.c. amplifying circuits with FP‐54 tubes is limited by the stability which can be obtained. In single‐tube circuits it is necessary to balance out fluctuations caused by changes in battery e.m.f. and in filament emission. Soller's circuit for balancing out e.m.f. changes has been studied in detail and a modified circuit has been developed in which the adjustments are less critical and which allows balancing out of changes in filament emission also. The latter is accomplished by balancing the plate current against the current to the space‐charge grid. Details of construction and manipulation of the new circuit are given, as well as data on its stability.

ISSN:0034-6748    

DOI:10.1063/1.1748993

出版商:AIP    

年代:1933

数据来源: AIP

摘要:

A new type radiofrequency phase meter, wherein the original voltages to be studied are heterodyned to convenient audiofrequencies for phase measurement, is described. By heterodyning both above and below the frequencies of the voltages being tested, the effects of undesired phase shifts within the apparatus are eliminated. Circuit constants which have given satisfactory results in practice are included. Accuracies of one‐tenth degree on angles up to ten degrees are readily attained at frequencies of 106cycles per second.

ISSN:0034-6748    

DOI:10.1063/1.1748994

出版商:AIP    

年代:1933

数据来源: AIP

摘要:

An electrostatic generating voltmeter is described which has a strictly linear scale, which has no commutators, and whose calibration is substantially independent of the speed of the driving motor and of the characteristics of the associated vacuum tube amplifier. A means of calibration by use of a wire grid in front of the voltmeter is also described.

ISSN:0034-6748    

DOI:10.1063/1.1748995

出版商:AIP    

年代:1933

数据来源: AIP