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Jan 1953

Volume 24, Issue 1, pp. 1-82

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The Liquefaction and Storage of Partially Converted Liquid Hydrogen

E. R. Grilly

Rev. Sci. Instrum. 24, 1 (1953); http://dx.doi.org/10.1063/1.1770507 (4 pages) | Cited 3 times

Online Publication Date: 29 December 2004

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Observations on the normal storage of liquid hydrogen showed the evaporation rate and ortho‐para conversion rate to be consistent with those expected from a noncatalyzed reaction. A catalytic converter which gives 50 percent ortho when cooled with liquid air was installed in the feed‐gas line of a 25 1∕hour hydrogen liquefaction plant. The decrease in storage loss is well worth the trouble of installation and operation of the converter.

Apparatus for Measuring Internal Friction in Transversely Vibrating Metal Reeds

W. R. Jewell

Rev. Sci. Instrum. 24, 5 (1953); http://dx.doi.org/10.1063/1.1770517 (6 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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This paper describes apparatus for measuring internal friction of nonferromagnetic reeds set in transverse vibration. It includes a description of a symmetrical transducer for inducing the vibrations and an optical method of observing the amplitude. Measurements can be made while the reed is temperature controlled and vibrating in a vacuum.

A Spiral‐Scanning X‐Ray Reflection Goniometer for the Rapid Determination of Preferred Orientations

A. N. Holden

Rev. Sci. Instrum. 24, 10 (1953); http://dx.doi.org/10.1063/1.1770508 (3 pages) | Cited 4 times

Online Publication Date: 29 December 2004

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A goniometer has been designed to rapidly scan polycrystalline metal samples along a spiral path in a stereographic projection, and which, when used with any recording counting‐rate meter available on a modern x‐ray spectrometer, enables the rapid determination of the preferred crystal orientations of the sample.

An Automatic Recording Gamma‐Ray Spectrometer

Thomas D. Strickler and Walter G. Wadey

Rev. Sci. Instrum. 24, 13 (1953); http://dx.doi.org/10.1063/1.1770509 (4 pages) | Cited 2 times

Online Publication Date: 29 December 2004

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A scintillation spectrometer making use of a large NaI∕TlI crystal mounted on an RCA 5819 photomultiplier tube has been constructed. It was designed for the high efficiency counting of gamma‐rays in the energy range 0.5–1.5 Mev. Techniques used for crystal mounting and assembly of apparatus have proved very satisfactory for prolonged operation. Additional components have been provided for automatic recording of data.

A New Type of Heat Interchanger for Large Liquefiers

J. Nicol, T. S. Smith, C. V. Heer, and J. G. Daunt

Rev. Sci. Instrum. 24, 16 (1953); http://dx.doi.org/10.1063/1.1770510 (4 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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Details are given of the design and performance of a heat interchanger suitable for transfering heat from a gas of high heat content per unit volume to one of low heat content per unit volume. The interchanger is suitable for use in large liquefiers, and a report is given of its performance in a helium liquefier giving 6.5 liters of liquid helium per hour. The construction is simple and involves no techniques not already available in an average laboratory workshop. A close correlation is reported between the computed and observed efficiencies and pressure drops in these interchangers.

Scattering of Light from Small Drops

Richard L. Lander and Carl E. Nielsen

Rev. Sci. Instrum. 24, 20 (1953); http://dx.doi.org/10.1063/1.1770511 (3 pages) | Cited 3 times

Online Publication Date: 29 December 2004

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Curves are given for the angular distribution of light scattered from drops of radius 1.4×10−3 cm and 4.8×10−4 cm for angles from 28° to 147°. The distribution is more nearly symmetrical than had been speculated and depends strongly on the drop size. The intensity of the scattered light was measured with a phototube circuit and galvanometer. The drops were produced in a downward diffusion chamber.

A Sensitive Photoelectric Method for Measuring the Faraday Effect

L. R. Ingersoll and W. L. James

Rev. Sci. Instrum. 24, 23 (1953); http://dx.doi.org/10.1063/1.1770512 (3 pages) | Cited 7 times

Online Publication Date: 29 December 2004

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A photoelectric method of measuring magneto‐optic rotations as small as 1″ is described. This employs an optical system whereby light from a tungsten lamp traverses two double‐image prisms and is focused by a series of concave mirrors on two 929 phototubes, after passing through a rotating polaroid chopper. The apparatus is now being used in an investigation of the Faraday effect in gases and vapors.

A Precision Recording Refractometer

S. E. J. Johnsen and P. D. Schnelle

Rev. Sci. Instrum. 24, 26 (1953); http://dx.doi.org/10.1063/1.1770513 (10 pages)

Online Publication Date: 29 December 2004

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An instrument is described which measures continuously and records the index of refraction of flowing liquid streams. The instrument is similar to a spectrograph employing a hollow prism through which the sample stream flows. Refractive index is inferred by measuring the position of the refracted beam of monochromatic light projected to form a slit image. Provision is made to compensate the instrument for rapid changes in temperature of the flowing stream of about ±10° Centigrade on either side of a reference temperature.

Magnetic Weighing and Gas‐Density Balances

J. H. Simons, C. L. Scheirer, and H. L. Ritter

Rev. Sci. Instrum. 24, 36 (1953); http://dx.doi.org/10.1063/1.1770514 (7 pages) | Cited 3 times

Online Publication Date: 29 December 2004

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A design is herein given for an electromagnetic device that can be employed instead of weights or springs for weighing purposes. In this particular design the balancing current is linear with the force applied to the arm of the balance so that current measurement gives a direct reading of weight. A capacity null‐point indicator is also described and so also are electrical circuits that enable this null‐point indicator to automatically operate the electromagnet. These auxiliaries are shown incorporated in a density balance. This balance was sensitive to a change of weight of better than 0.0000001 gram or in terms of oxygen pressure at room temperature to 0.02 mm of Hg. The designs of density balances are discussed.

Radial Oscillations in the Cyclotron

P. V. C. Hough

Rev. Sci. Instrum. 24, 42 (1953); http://dx.doi.org/10.1063/1.1770515 (7 pages) | Cited 2 times

Online Publication Date: 29 December 2004

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The excitation and evolution of the radial oscillations of ions in the cyclotron has been studied theoretically and experimentally. A simple method for calculating the pattern of the oscillations leads to detailed criteria for the preparation of the magnetic field and a systematic theory of shimming. A new method for measuring the pattern of the oscillations is used to check the theory. The results are applied briefly to the problem of beam extraction.
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A Photometer and Absorption Cell Attachment for Ultramicro‐Spectrophotometry

R. Craig, A. Bartel, and Paul L. Kirk

Rev. Sci. Instrum. 24, 49 (1953); http://dx.doi.org/10.1063/1.1770516 (4 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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A cell holder and photometer for use with the Beckman Model DU spectrophotometer is described. The cell holder is designed to position capillary cells of small diameter, e.g. 0.7 mm and 5 cm in length in the narrow beam of light passed through fine collimating masks. The capacity of the cells is about 20 mm3 which allows analysis of quantities about 10 times smaller than have been hitherto analyzable. The photometer employs a multiplier phototube in order to achieve the requisite sensitivity for the small amount of light transmitted.

Application of High Speed Flash Tube to Photographing the Fundus of the Eye in Color

Martin Jacobs and Kenneth N. Ogle

Rev. Sci. Instrum. 24, 52 (1953); http://dx.doi.org/10.1063/1.1770519 (4 pages)

Online Publication Date: 29 December 2004

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A high speed flash tube is adapted to the Nordensen retinal camera, so that the fundus of the human eye can be photographed in color. The high speed flash eliminates the usually deleterious effect of blinking and eye movements. Special electronic circuits are needed to provide a flickering light from the same flash tube to enable the operator to adjust and focus the camera. Ektachrome film is used and this is over‐developed to gain equivalent exposure. For the fundus photographs this apparently results in no loss of color relationships.
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The Recovery and Purification of Tritium and He3 Used in Ion Accelerators

K. W. Allen and E. Almqvist

Rev. Sci. Instrum. 24, 70 (1953); http://dx.doi.org/10.1063/1.1770520 (2 pages) | Cited 7 times

Online Publication Date: 29 December 2004

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Abstract Unavailable

Chart Reader for Galvanometer‐Type Recording Instruments

Bernard Manning and Margo Sylvester

Rev. Sci. Instrum. 24, 71 (1953); http://dx.doi.org/10.1063/1.1770521 (2 pages)

Online Publication Date: 29 December 2004

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A Simple Thermal Conductivity Analyzer for Ortho‐Para Hydrogen

E. R. Grilly

Rev. Sci. Instrum. 24, 72 (1953); http://dx.doi.org/10.1063/1.1770522 (2 pages) | Cited 25 times

Online Publication Date: 29 December 2004

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Construction of External Cathode Geiger Counters

R. O. Jenkins and R. W. Taylor

Rev. Sci. Instrum. 24, 73 (1953); http://dx.doi.org/10.1063/1.1770523 (1 page) | Cited 2 times

Online Publication Date: 29 December 2004

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An Electron Gun Modification for the Control of Beam Current in the RCA Electron Microscope

Francis W. Bishop

Rev. Sci. Instrum. 24, 73 (1953); http://dx.doi.org/10.1063/1.1770524 (2 pages)

Online Publication Date: 29 December 2004

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A Simplified Method for the Absolute Calibration of Velocity Gauges

David S. Cohen

Rev. Sci. Instrum. 24, 74 (1953); http://dx.doi.org/10.1063/1.1770525 (2 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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On the Use of Printed Circuit Conductors

Richard J. Watts

Rev. Sci. Instrum. 24, 75 (1953); http://dx.doi.org/10.1063/1.1770526 (2 pages)

Online Publication Date: 29 December 2004

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A New Cloud‐Chamber Valve

B. Meyer and W. Stodiek

Rev. Sci. Instrum. 24, 76 (1953); http://dx.doi.org/10.1063/1.1770527 (1 page) | Cited 2 times

Online Publication Date: 29 December 2004

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FM Data Reduction from Magnetic Tape Recordings

Louis Costrell

Rev. Sci. Instrum. 24, 76 (1953); http://dx.doi.org/10.1063/1.1770528 (2 pages)

Online Publication Date: 29 December 2004

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A Doser for Admitting Measured Amounts of Vapor

D. M. Young

Rev. Sci. Instrum. 24, 77 (1953); http://dx.doi.org/10.1063/1.1770529 (2 pages)

Online Publication Date: 29 December 2004

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An Improved Boat for Collecting Thin Sections for Electron Microscopy

Francis W. Bishop

Rev. Sci. Instrum. 24, 78 (1953); http://dx.doi.org/10.1063/1.1770530 (2 pages)

Online Publication Date: 29 December 2004

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Sectioning of Hydrocarbon Gels for the Electron Microscope

R. F. Baker, H. Coffer, O. Warren, R. D. Vold, and D. Pease

Rev. Sci. Instrum. 24, 79 (1953); http://dx.doi.org/10.1063/1.1770531 (1 page)

Online Publication Date: 29 December 2004

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A Mercury Piston Gas Pump

Donald L. Buchanan

Rev. Sci. Instrum. 24, 79 (1953); http://dx.doi.org/10.1063/1.1770532 (2 pages)

Online Publication Date: 29 December 2004

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Abstract Unavailable
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