1. |
MEASUREMENT OF FIBER DIAMETERS BY THE DIFFRACTION METHOD |
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Review of Scientific Instruments,
Volume 2,
Issue 5,
1931,
Page 263-286
H. J. McNicholas,
H. J. Curtis,
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摘要:
The classification of wool fibers into standard grades is based entirely on the average diameter of the fibers. The diffraction of light by a bundle of parallel fibers was employed by Thomas Young in 1824 in a simple ingenious instrument for the rapid direct measurement of average diameter, but no thorough investigation has ever been made of the practical possibilities of this method in the routine grading of wool.In the present paper a new construction of Young's instrument (the eriometer) is described, and a critical study is made of the accuracy and adaptibility of the instrument in the averaging of a wide range of diameters as distributed in a group of fibers. Sources of error and limitations of the method are discussed.It is found that the eriometer average is in excellent agreement with comparable data obtained with the microscope. The method affords considerable opportunity for the further development of instruments to include additional features desirable in the study of wool or other textile fibers.
ISSN:0034-6748
DOI:10.1063/1.1748788
出版商:AIP
年代:1931
数据来源: AIP
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2. |
PHOTOGRAPHIC METHOD FOR SECURING COPIES OF DIAGRAMS, ETC., WITHOUT THE USE OF A CAMERA |
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Review of Scientific Instruments,
Volume 2,
Issue 5,
1931,
Page 287-289
E. J. Haverstick,
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ISSN:0034-6748
DOI:10.1063/1.1748789
出版商:AIP
年代:1931
数据来源: AIP
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3. |
A METHOD FOR MEASURING HIGH VOLTAGES OR LOW CAPACITANCES |
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Review of Scientific Instruments,
Volume 2,
Issue 5,
1931,
Page 290-292
J. A. Van den Akker,
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ISSN:0034-6748
DOI:10.1063/1.1748790
出版商:AIP
年代:1931
数据来源: AIP
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4. |
A SPECTROGRAPH PLATE SHIELD |
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Review of Scientific Instruments,
Volume 2,
Issue 5,
1931,
Page 293-296
J. Tracy Lay,
I. Clyde Cornog,
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摘要:
A shield designed for use in a spectrograph to prevent pre‐exposure and subsequent exposure of the photographic plate due to scattered light when a number of spectra are photographed on the same plate or film. The use of such a shield eliminates consequent errors in the densities of spectral lines as determined by a densitometer.
ISSN:0034-6748
DOI:10.1063/1.1748791
出版商:AIP
年代:1931
数据来源: AIP
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5. |
AN AUTOMATIC RACE TIMER |
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Review of Scientific Instruments,
Volume 2,
Issue 5,
1931,
Page 297-304
Edwin A. Speakman,
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摘要:
The instrument described is used to time races by the use of a microphone, a photoelectric cell, an amplifier, and a clock. The time is recorded in 1/120 of a second from the instant when the sound of the starting gun reaches the runner's ear to the instant when the runner's chest touches the tape at the finish.
ISSN:0034-6748
DOI:10.1063/1.1748792
出版商:AIP
年代:1931
数据来源: AIP
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6. |
A PANTOGRAPH FOR ENLARGING X‐RAY PHOTOGRAPHS |
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Review of Scientific Instruments,
Volume 2,
Issue 5,
1931,
Page 305-306
C. J. Ksanda,
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ISSN:0034-6748
DOI:10.1063/1.1748793
出版商:AIP
年代:1931
数据来源: AIP
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7. |
A New X‐Ray Spectrograph for Wave‐length Determinations in Air. (Errata) |
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Review of Scientific Instruments,
Volume 2,
Issue 5,
1931,
Page 308-308
S. Zeidenfeld,
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ISSN:0034-6748
DOI:10.1063/1.1748794
出版商:AIP
年代:1931
数据来源: AIP
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8. |
ABSTRACTS OF ARTICLES RELATING TO NEW INSTRUMENTS AND METHODS |
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Review of Scientific Instruments,
Volume 2,
Issue 5,
1931,
Page 309-320
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PDF (461KB)
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ISSN:0034-6748
DOI:10.1063/1.1748795
出版商:AIP
年代:1931
数据来源: AIP
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