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1. |
Support for Science |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 339-340
H. A. B.,
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ISSN:0034-6748
DOI:10.1063/1.1751739
出版商:AIP
年代:1934
数据来源: AIP
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2. |
Dielectric Power Factor Measurements at Audio‐ and Radiofrequencies |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 341-345
G. M. L. Sommerman,
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PDF (329KB)
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摘要:
The paper presents a description of sensitive and accurate apparatus for measuring the power factor of dielectrics in the frequency range, 60–7,200,000 c.p.s. A Wien bridge with Wagner ground for the direct measurement of both power factor and frequency in the range, 60–10,000 c.p.s. is described. Double shielding of the series resistance arm eliminates errors otherwise inherent in this bridge. The operation of the resonance‐substitution method is discussed for the frequency range, 10,000–7,200,000 c.p.s. Errors due to eddy current losses are eliminated through measurements on loss free liquids. A measuring cell for use with these circuits and also with d.c. measuring circuits is described. Some experimental power factor‐frequency curves illustrating the results obtainable with this apparatus are presented. It is shown that power factor‐frequency data furnish a delicate method of tracing out dispersion phenomena and are useful where the concentration or electric moment of material producing dispersion is small.
ISSN:0034-6748
DOI:10.1063/1.1751740
出版商:AIP
年代:1934
数据来源: AIP
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3. |
A High Pressure Wilson Expansion‐Chamber |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 346-350
L. M. Mott‐Smith,
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PDF (270KB)
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ISSN:0034-6748
DOI:10.1063/1.1751741
出版商:AIP
年代:1934
数据来源: AIP
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4. |
A Direct‐Reading, Two‐Crystal X‐Ray Spectrometer |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 351-355
F. K. Richtmyer,
S. W. Barnes,
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PDF (296KB)
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摘要:
A two‐crystal x‐ray spectrometer is described in which wave‐lengths are read directly to 0.01 X.U. from the drum of a precision micrometer screw. Methods of initial adjustment are given in brief outline and as sample results there are shown the close linesL&ggr;2andL&ggr;6of Au(79); and the ``foot'' ofL&agr;1of the same element, with the accompanying satellites, the intensity of which is found to be 0.060 of that ofL&agr;1.
ISSN:0034-6748
DOI:10.1063/1.1751742
出版商:AIP
年代:1934
数据来源: AIP
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5. |
The New Askania Torsion Balance with Inclined Beams and Short Period of Observation |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 356-358
H. Imhof,
A. Graf,
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PDF (198KB)
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ISSN:0034-6748
DOI:10.1063/1.1751743
出版商:AIP
年代:1934
数据来源: AIP
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6. |
A Seismographic Recorder |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 359-361
Halley Wolfe,
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PDF (178KB)
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摘要:
A recorder used for making ink records of low frequency oscillations of a small rotating mirror (such as, for example, a galvanometer mirror) is described: a light beam, modulated in accordance with the mirror vibrations, excites a photoelectric cell, the output of which is sufficiently amplified by a low frequency amplifier to control a pen writer. Since the instrument has been developed for use in conjunction with photographically recording seismographs, the treatment in the article is from a seismological point of view. The frequency response of the recorder alone is calculated, and the method of obtaining it for the entire system of the recorder in combination with a given seismograph is indicated. Records are shown to demonstrate the fidelity of reproduction.
ISSN:0034-6748
DOI:10.1063/1.1751744
出版商:AIP
年代:1934
数据来源: AIP
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7. |
An Apparatus for Electrodialysis |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 362-365
Paul D. Watson,
Philip N. Peter,
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PDF (252KB)
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ISSN:0034-6748
DOI:10.1063/1.1751745
出版商:AIP
年代:1934
数据来源: AIP
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8. |
An Evenness Tester |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 365-366
Irving J. Saxl,
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PDF (97KB)
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ISSN:0034-6748
DOI:10.1063/1.1751746
出版商:AIP
年代:1934
数据来源: AIP
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9. |
Purification of Inert Gas with Mischmetal |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 367-368
C. C. Van Voorhis,
A. G. Shenstone,
E. W. Pike,
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PDF (123KB)
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ISSN:0034-6748
DOI:10.1063/1.1751747
出版商:AIP
年代:1934
数据来源: AIP
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10. |
A Portable Vacuum Spectrograph |
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Review of Scientific Instruments,
Volume 5,
Issue 10,
1934,
Page 368-369
Thomas H. Osgood,
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PDF (126KB)
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ISSN:0034-6748
DOI:10.1063/1.1751748
出版商:AIP
年代:1934
数据来源: AIP
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