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Oct 1934

Volume 5, Issue 10, pp. 339-382

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Support for Science

H. A. B.

Rev. Sci. Instrum. 5, 339 (1934); http://dx.doi.org/10.1063/1.1751739 (2 pages)

Online Publication Date: 27 December 2004

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Dielectric Power Factor Measurements at Audio‐ and Radiofrequencies

G. M. L. Sommerman

Rev. Sci. Instrum. 5, 341 (1934); http://dx.doi.org/10.1063/1.1751740 (5 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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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.

A High Pressure Wilson Expansion‐Chamber

L. M. Mott‐Smith

Rev. Sci. Instrum. 5, 346 (1934); http://dx.doi.org/10.1063/1.1751741 (5 pages) | Cited 6 times

Online Publication Date: 27 December 2004

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A Direct‐Reading, Two‐Crystal X‐Ray Spectrometer

F. K. Richtmyer and S. W. Barnes

Rev. Sci. Instrum. 5, 351 (1934); http://dx.doi.org/10.1063/1.1751742 (5 pages) | Cited 9 times

Online Publication Date: 27 December 2004

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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 lines Lγ2 and Lγ6 of Au(79); and the ``foot'' of Lα1 of the same element, with the accompanying satellites, the intensity of which is found to be 0.060 of that of Lα1.

The New Askania Torsion Balance with Inclined Beams and Short Period of Observation

H. Imhof and A. Graf

Rev. Sci. Instrum. 5, 356 (1934); http://dx.doi.org/10.1063/1.1751743 (3 pages)

Online Publication Date: 27 December 2004

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A Seismographic Recorder

Halley Wolfe

Rev. Sci. Instrum. 5, 359 (1934); http://dx.doi.org/10.1063/1.1751744 (3 pages) | Cited 2 times

Online Publication Date: 27 December 2004

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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.

An Apparatus for Electrodialysis

Paul D. Watson and Philip N. Peter

Rev. Sci. Instrum. 5, 362 (1934); http://dx.doi.org/10.1063/1.1751745 (4 pages)

Online Publication Date: 27 December 2004

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An Evenness Tester

Irving J. Saxl

Rev. Sci. Instrum. 5, 365 (1934); http://dx.doi.org/10.1063/1.1751746 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Purification of Inert Gas with Mischmetal

C. C. Van Voorhis, A. G. Shenstone, and E. W. Pike

Rev. Sci. Instrum. 5, 367 (1934); http://dx.doi.org/10.1063/1.1751747 (2 pages) | Cited 4 times

Online Publication Date: 27 December 2004

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A Portable Vacuum Spectrograph

Thomas H. Osgood

Rev. Sci. Instrum. 5, 368 (1934); http://dx.doi.org/10.1063/1.1751748 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Gear Ratios for Converting Civil into Sidereal Time

A. E. Flanigan

Rev. Sci. Instrum. 5, 370 (1934); http://dx.doi.org/10.1063/1.1751749 (1 page)

Online Publication Date: 27 December 2004

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Simple ratios are computed which very closely approximate the ratio of the length of the civil second to that of the sidereal second, and which define gear trains for converting civil into sidereal time.

Voltage Stabilizer Controlled by a Thermionic Pentode

Robley D. Evans

Rev. Sci. Instrum. 5, 371 (1934); http://dx.doi.org/10.1063/1.1751750 (5 pages) | Cited 22 times

Online Publication Date: 27 December 2004

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A voltage stabilizing circuit employing one thermionic pentode vacuum tube and one standard 45 v dry battery is described. When used in connection with a conventional a.c. to d.c. rectifier the stabilizer fully compensates for fluctuations in the a.c. mains and provides a d.c. output of zero to several thousand volts in which the fluctuations are less than 1 part in 5000. No current is drawn from the dry battery, hence its useful life is a year or more. Circuit constants are given for stabilizers supplying 85, 135, 600, 1000 and 1400 volts at currents from 15 to 0.5 milliamperes. A general theory of all similar triode, tetrode and pentode stabilizer units is derived, and the impracticability of eliminating the single dry battery is pointed out.

Automatic Recording Micro‐Osmometer for Colloidal Osmotic Pressures

Frank Urban

Rev. Sci. Instrum. 5, 375 (1934); http://dx.doi.org/10.1063/1.1751751 (3 pages)

Online Publication Date: 27 December 2004

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A Method of Correcting the Periodic Error of a Gear‐Driven Precision Condenser

J. E. Binns and W. I. Kisner

Rev. Sci. Instrum. 5, 377 (1934); http://dx.doi.org/10.1063/1.1751752 (2 pages)

Online Publication Date: 27 December 2004

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Thermal Leakage Rates of Dewar Bottles

Walter P. White

Rev. Sci. Instrum. 5, 379 (1934); http://dx.doi.org/10.1063/1.1751753 (1 page)

Online Publication Date: 27 December 2004

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PHYSICS NEWS

Rev. Sci. Instrum. 5, 382 (1934); http://dx.doi.org/10.1063/1.1751754 (1 page)

Online Publication Date: 27 December 2004

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