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Jan 1951

Volume 22, Issue 1, pp. 1-66


Radio Telemetry

M. H. Nichols and L. L. Rauch

Rev. Sci. Instrum. 22, 1 (1951); http://dx.doi.org/10.1063/1.1745733 (29 pages) | Cited 2 times

Online Publication Date: 20 December 2004

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Abstract Unavailable

Electron Energy Studies with the Anthracene Scintillation Counter

J. I. Hopkins

Rev. Sci. Instrum. 22, 29 (1951); http://dx.doi.org/10.1063/1.1745734 (5 pages) | Cited 27 times

Online Publication Date: 20 December 2004

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Using a β‐ray lens spectrometer to supply electrons of a given energy, a study of the response of the anthracene scintillation counter to monoenergetic electrons has been made. It has been found that pulse height varies linearly with energy from 125 to 3200 kev but below 125 kev the pulse height varies less rapidly with energy. The differential counting rate distribution for given energy settings of the lens spectrometer were found to follow a Gaussian distribution and that on the average 3.3 kev is required to produce one effective photo‐electron at the cathode. When Morton's correction for dynode losses is applied, it is found to require 2.5 kev for the production of one photo‐electron at the cathode or that 400 electrons enter the multiplier per Mev of incident electron energy. This is in agreement with the 420 electrons per Mev obtained by direct measurement. Assuming a 10 percent photoelectric efficiency at the photo‐sensitive surface, it appears that the efficiency of anthracene for the conversion of incident electron energy into photon energy is of the order of one to two percent.

The Double Super‐Heterodyne Principle Applied to Dielectric Measurements

Edward B. Baker

Rev. Sci. Instrum. 22, 34 (1951); http://dx.doi.org/10.1063/1.1745735 (3 pages) | Cited 2 times

Online Publication Date: 20 December 2004

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By use of two mixers and a common variable local oscillator, a super‐heterodyne receiver, such as General Radio Wave Analyzer No. 736‐A, can be converted to serve simultaneously as generator and detector. Such an arrangement provides: (1) single dial tuning, (2) absolute freedom from relative frequency drift, (3) the possibility of very narrow band tuning and, thus, improved signal‐to‐noise ratio. Circuits to accomplish this are described for the range 0–16 kc which occupy no more space than a conventional oscillator, which they replace. Extension of the frequency range to 0–600 kc is possible by simple changes and the use of an RAK‐7 commercial receiver, although in this case single dial tuning is not possible. These circuits are particularly useful for automatic balancing dielectric bridges, but should also be very useful in work with vibration and sound, and for filter and amplifier frequency response.

The Elimination of the End Effects in Counters

A. L. Cockroft and S. C. Curran

Rev. Sci. Instrum. 22, 37 (1951); http://dx.doi.org/10.1063/1.1745736 (6 pages) | Cited 46 times

Online Publication Date: 20 December 2004

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The operation of cylindrical proportional and Geiger counters near the ends of the wire is examined closely by means of thin sheets of soft homogeneous X‐radiation. It is found that small field‐adjusting tubes, fitted over the usual grounded guard tubes (where these are required) and maintained at the potential appropriate to their diameter, reduce the end effects to negligible proportions. The computed field distribution is thus confirmed experimentally. Both theory and practice show that the concentric field‐adjusting and guard tubes need not be longer than a radius of the counter. The method can be used in designing counters of very short operating length. In practice the technique is simple and it can be applied to the construction of ionization chambers (pulse or steady current type), proportional counters with constant gas gain along the whole wire, and Geiger counters. It insures in each case a precisely defined counting volume.

An Electromagnetic Flowmeter for Transient Flow Studies

James S. Arnold

Rev. Sci. Instrum. 22, 43 (1951); http://dx.doi.org/10.1063/1.1745737 (13 pages) | Cited 7 times

Online Publication Date: 20 December 2004

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An adaptation of the electromagnetic flowmeter has been made for the observation of transients in liquid flows. The device responds to flow transients of 0.001‐sec duration, and is not affected by ambient pressure changes or the velocity profile of the liquid in the conduit. The effects of fluid resistivity on the instrument are noted.
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Averaged Measurement of Optical Transmission

Edward E. Miller

Rev. Sci. Instrum. 22, 56 (1951); http://dx.doi.org/10.1063/1.1745738 (2 pages) | Cited 2 times

Online Publication Date: 20 December 2004

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Abstract Unavailable

A Universal Range Selector for Strip Chart Recorders

Edgar A. Bunt

Rev. Sci. Instrum. 22, 57 (1951); http://dx.doi.org/10.1063/1.1745739 (2 pages) | Cited 1 time

Online Publication Date: 20 December 2004

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Abstract Unavailable

An Electron Current Regulator for Mass Spectrometer Ion Sources

V. J. Caldecourt

Rev. Sci. Instrum. 22, 58 (1951); http://dx.doi.org/10.1063/1.1745740 (2 pages) | Cited 2 times

Online Publication Date: 20 December 2004

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Abstract Unavailable

Automatic Range Changer for Strip Chart Recorder

Charles F. Salzman

Rev. Sci. Instrum. 22, 59 (1951); http://dx.doi.org/10.1063/1.1745741 (2 pages)

Online Publication Date: 20 December 2004

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Abstract Unavailable

A Note on the Successive Peaks of Spurious Counts in G‐M Tubes

James E. Kupperian, Paul C. Murray, and H. Feeny

Rev. Sci. Instrum. 22, 60 (1951); http://dx.doi.org/10.1063/1.1745742 (2 pages) | Cited 3 times

Online Publication Date: 20 December 2004

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Abstract Unavailable

Ratio Circuit for Turbidimeter

T. Mariner and Robert F. Stamm

Rev. Sci. Instrum. 22, 61 (1951); http://dx.doi.org/10.1063/1.1745743 (2 pages) | Cited 2 times

Online Publication Date: 20 December 2004

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Abstract Unavailable

Improvements in a Method for Preparing Plastic Powder‐Sample Capillary Tubes

Karl E. Beu

Rev. Sci. Instrum. 22, 62 (1951); http://dx.doi.org/10.1063/1.1745744 (1 page) | Cited 3 times

Online Publication Date: 20 December 2004

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Abstract Unavailable
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New Instruments

W. A. Wildhack

Rev. Sci. Instrum. 22, 63 (1951); http://dx.doi.org/10.1063/1.1745745 (3 pages)

Online Publication Date: 20 December 2004

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Abstract Unavailable
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New Materials

Forest K. Harris

Rev. Sci. Instrum. 22, 65 (1951); http://dx.doi.org/10.1063/1.1745746 (2 pages)

Online Publication Date: 20 December 2004

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Abstract Unavailable
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