摘要:

A description is given of a simple angle centrifuge which utilizes a direct universal motor drive that is capable of spinning an 8‐inch rotor at 18,000 r.p.m. with an applied potential of 180 volts and at 12,500 r.p.m. with a potential of 115 volts. Specifications and operational data are given for rotors having diameters ranging from 7 to 10¼ inches and capacities ranging from 112 to 610 cc of fluid.

ISSN:0034-6748    

DOI:10.1063/1.1769997

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

A detailed graphical method for determining mechanical stresses in high speed angle centrifuges is explained and equations convenient for obtaining approximate values are presented. Various points of design are discussed, and stresses have been determined for several typical rotors to serve as guides for the designer. Theoretical considerations indicate that a properly designed rotor having a diameter of 20 cm and accommodating several hundred cubic centimeters of fluid can operate at speeds up to 50,000 r.p.m. for thousands of runs.

ISSN:0034-6748    

DOI:10.1063/1.1769984

出版商:AIP    

年代:1942

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1769985

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

Electronic circuits are described which, over a wide range of frequency and wave form, generate output voltages accurately proportional at every instant to the time derivative of their input potentials. Three basic circuits are described which provide successively increasing accuracy of differentiation with attendant increases in complexity of construction and delicacy of adjustment. Criteria are provided for choosing between the circuits for particular applications.

ISSN:0034-6748    

DOI:10.1063/1.1769986

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

A complete control circuit for use with the usual triode ionization gauge tube is described. A modified Ridenour Lampson type circuit is employed to stabilize grid and plate voltage, as well as emission current. A simple vacuum tube voltmeter circuit permits the use of a relatively rugged 0–1 milliameter to read plate current. Special provision is made for outgassing, and for leak hunting.

ISSN:0034-6748    

DOI:10.1063/1.1769987

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

The value and uses of supersonic velocity and absorption measurements are reviewed, and evidence that sound velocity measurements may still be used for heat capacity determinations is presented. An apparatus which is designed for (1) a general study of acoustical dispersion, and (2) the supersonic measurement of gaseous heat capacities. The general experimental technique to be used with such an apparatus is outlined, and results of measurements of the velocity of sound in air and of the heat capacity of propylene are briefly discussed.

ISSN:0034-6748    

DOI:10.1063/1.1769988

出版商:AIP    

年代:1942

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1769990

出版商:AIP    

年代:1942

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1769992

出版商:AIP    

年代:1942

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1769993

出版商:AIP    

年代:1942

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1769995

出版商:AIP    

年代:1942

数据来源: AIP