摘要:

Glass, celluloid, cellulose acetate, hard and soft rubber and seven synthetic resins have been tested to determine their suitability for photoelastic investigations. The stress‐strain relations, photoelastic coefficients and annealing temperatures have been measured. It is concluded that the synthetic resins Phenolite, Bakelite, and L'Orca are among the most satisfactory materials for photoelastic purposes.

ISSN:0034-6748    

DOI:10.1063/1.1751728

出版商:AIP    

年代:1934

数据来源: AIP

摘要:

The electrical theory of the rotary voltmeter is developed and the conclusion drawn that the instrument may be employed for analysis of the wave forms of a large class of periodically varying voltages. Two experimental methods for performing these analyses are described and experimental results are presented, pertaining to both high and low potentials.

ISSN:0034-6748    

DOI:10.1063/1.1751729

出版商:AIP    

年代:1934

数据来源: AIP

摘要:

In this instrument the conductor being inspected is passed axially through a coil forming a part of the tuned circuit of an oscillator. Any flaws in the conductor cause a change in the tuning, and thus in the frequency generated, which is conveniently observed through heterodyning with a fixed frequency. By using high frequency, of the order of 6000 kilocycles, the response is limited to flaws near the surface of the conductor. This instrument is used in the factory inspection of tungsten wire, particularly for the location of longitudinal cracks, and is also effective in the determination of asymmetry of coated wires.

ISSN:0034-6748    

DOI:10.1063/1.1751730

出版商:AIP    

年代:1934

数据来源: AIP

摘要:

The advantages of carbon dioxide for detecting and locating leaks in vacuum apparatus are noted here, with descriptions of methods used, especially for very small leaks.

ISSN:0034-6748    

DOI:10.1063/1.1751731

出版商:AIP    

年代:1934

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751732

出版商:AIP    

年代:1934

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751733

出版商:AIP    

年代:1934

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751736

出版商:AIP    

年代:1934

数据来源: AIP