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Dec 1947

Volume 18, Issue 12, pp. 869-935


Physics in Great Britain Since the War

N. F. Mott

Rev. Sci. Instrum. 18, 869 (1947); http://dx.doi.org/10.1063/1.1740871 (3 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

Analysis of the Impulses from Geiger‐Mueller Tubes

S. C. Curran and E. R. Rae

Rev. Sci. Instrum. 18, 871 (1947); http://dx.doi.org/10.1063/1.1740872 (6 pages) | Cited 17 times

Online Publication Date: 17 December 2004

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Abstract Unavailable

Automatic Integration of Linear Sixth‐Order Differential Equations by Means of Punched‐Card Machines

L. F. Hausman and M. Schwarzschild

Rev. Sci. Instrum. 18, 877 (1947); http://dx.doi.org/10.1063/1.1740873 (7 pages) | Cited 2 times

Online Publication Date: 17 December 2004

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It is shown how punched‐card‐relay calculators can be used for solving ordinary linear differential equations of sixth and lower order. The differential equations are replaced by difference equations which can be solved by the relay calculators automatically step by step. The final solution is obtained by repeating the integration several times, each time computing the truncation error and applying it as a correction in the subsequent integration.

A Precision Alpha‐Proportional Counter

J. A. Simpson

Rev. Sci. Instrum. 18, 884 (1947); http://dx.doi.org/10.1063/1.1740874 (10 pages) | Cited 5 times

Online Publication Date: 17 December 2004

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An instrument is described which will detect and record the alpha‐disintegration rate of prepared radioactive samples even though soft beta‐radiation up to 5×109 disintegrations per minute may also be present. The counting losses arising from the detector, electronic amplifier, scaler, and recorder total 0.8 percent with an alpha‐counting rate of 105 counts per minute. The instrument employs a proportional counter through which 99 percent CH4 at one atmosphere slowly flows. The proportional counting region is approximately 300 volts in length, with 0.5 percent change in counting rate in an interval of 200 volts. Thin radioactive samples deposited on metal disks up to 2.5 cm in diameter are easily inserted into the counter volume by means of a special gas lock. The counter detects 0.50 of the disintegrations from a thin radioactive sample. The counter background can be maintained at about 14 counts per hour. A high vacuum, low geometry attachment provides reductions in geometry down to at least 10−5 of the sample counting rate. Some theory of gas‐flow proportional counters is presented along with details of the instrument construction.

Concave Metallic Replica Gratings

I. Šimon

Rev. Sci. Instrum. 18, 894 (1947); http://dx.doi.org/10.1063/1.1740875 (3 pages)

Online Publication Date: 17 December 2004

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A method is described of producing metallic replicas from gratings by electro‐deposition of copper. It is possible to obtain concave replicas from a convex original grating—either metallic or glass. The optical figure and the grating qualities of the replicas are tested and shown in Figs. 2 to 6.
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Erratum: Some Precision Circuit Techniques Used in Wave‐Form Generation and Time Measurement

Britton Chance

Rev. Sci. Instrum. 18, 896 (1947); http://dx.doi.org/10.1063/1.1740876 (1 page)

Online Publication Date: 17 December 2004

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Abstract Unavailable

Calibration of a Ra+Be Neutron Source by the B(n, α)Li Reaction

F. G. P. Seidl and S. P. Harris

Rev. Sci. Instrum. 18, 897 (1947); http://dx.doi.org/10.1063/1.1740877 (3 pages) | Cited 2 times

Online Publication Date: 17 December 2004

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A method has been developed for determining absolute numbers of neutrons in terms of helium production in the B(n, α)Li reaction. We are able to report preliminary measurements of the number of neutrons emitted per second from a certain Ra+Be source; i.e., source called No. 38, which contains 504 millicuries of Ra, was found to emit (5.5±0.4)×106 neutrons per second.

R‐F System for Frequency Modulated Cyclotron

K. R. MacKenzie and V. B. Waithman

Rev. Sci. Instrum. 18, 900 (1947); http://dx.doi.org/10.1063/1.1740878 (8 pages) | Cited 3 times

Online Publication Date: 17 December 2004

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A grounded grid oscillator and a single dee resonant system for use with a frequency modulated cyclotron are described. 7.5‐Mev deuterons have been accelerated with dee voltages up to 15 kv and a frequency range from 9.5 to 12 megacycles. 15‐Mev protons have been accelerated with voltages up to 11 kv and a frequency range from 19 to 24 megacycles. Coupling constants, phase correction, amplitude modulation, and discharge phenomena are discussed.

A High Speed Coincidence Circuit

R. H. Dicke

Rev. Sci. Instrum. 18, 907 (1947); http://dx.doi.org/10.1063/1.1740879 (8 pages) | Cited 3 times

Online Publication Date: 17 December 2004

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A coincidence circuit with a resolving time of from 10−9 to 10−10 second is described. It will operate satisfactorily with a 20‐db variation in the pulse energy and discriminate against non‐coincident pulses occurring at a rate of from 108 to 109 per second. Experimental results are given.
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Erratum : Azimuthal Variation of Betatron Fields at Injection Time

G. D. Adams, D. W. Kerst, and D. T. Scag

Rev. Sci. Instrum. 18, 914 (1947); http://dx.doi.org/10.1063/1.1740880 (1 page)

Online Publication Date: 17 December 2004

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Abstract Unavailable

An Electronic Analytical Balance

John W. Clark

Rev. Sci. Instrum. 18, 915 (1947); http://dx.doi.org/10.1063/1.1740881 (4 pages) | Cited 8 times

Online Publication Date: 17 December 2004

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An electronic instrument is described which will weigh small objects with precision comparable to that of the chemical beam balance. It is a direct‐reading instrument of the null‐balance type, and is faster to use and requires less skill on the part of the operator than does the mechanical balance.

An Apparatus for Micro Gas Analysis

Carl Kenty and Frederic W. Reuter

Rev. Sci. Instrum. 18, 918 (1947); http://dx.doi.org/10.1063/1.1740882 (7 pages) | Cited 4 times

Online Publication Date: 17 December 2004

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Gas samples of a few micron liters can be analyzed to within a few percent accuracy with the described system. Identification of components is made from condensation points, comparison readings of Pirani and McLeod gauges, and differences in speeds of flow. Condensation points at sub‐liquid nitrogen temperatures are had by evaporating liquid nitrogen at reduced pressures. Except for the removal of CO and H2 by ignition with O2, and O2 with a tungsten filament, chemical methods have been eliminated. Transfer of minute gas quantities is greatly facilitated by use of small mercury‐diffusion pumps.
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Erratum: A Simple Scanner for X‐Ray Diffraction

Robert H. Hay

Rev. Sci. Instrum. 18, 924 (1947); http://dx.doi.org/10.1063/1.1740883 (1 page)

Online Publication Date: 17 December 2004

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Abstract Unavailable
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Note on the Photography of Cathode‐Ray Oscillograms

M. V. Scherb

Rev. Sci. Instrum. 18, 925 (1947); http://dx.doi.org/10.1063/1.1740884 (1 page) | Cited 2 times

Online Publication Date: 17 December 2004

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Abstract Unavailable

Automatic Switch for Protecting Water‐Cooled X‐Ray Tubes

Karl E. Beu

Rev. Sci. Instrum. 18, 926 (1947); http://dx.doi.org/10.1063/1.1740885 (1 page) | Cited 2 times

Online Publication Date: 17 December 2004

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Abstract Unavailable

Use of Oil‐Diffusion Pumps in Mass Spectrometers

T. D. Morgan

Rev. Sci. Instrum. 18, 926 (1947); http://dx.doi.org/10.1063/1.1740886 (2 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

Self‐Filling Micro Infra‐Red Absorption Cell

N. B. Colthup and V. Z. Williams

Rev. Sci. Instrum. 18, 927 (1947); http://dx.doi.org/10.1063/1.1740887 (2 pages) | Cited 3 times

Online Publication Date: 17 December 2004

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Abstract Unavailable

Comparison of Glower and Globar Sources for Infra‐Red Spectrometry

R. A. Friedel and A. G. Sharkey

Rev. Sci. Instrum. 18, 928 (1947); http://dx.doi.org/10.1063/1.1740888 (1 page) | Cited 1 time

Online Publication Date: 17 December 2004

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See Also: Erratum

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back to top New Instruments

New Instruments

W. A. Wildhack

Rev. Sci. Instrum. 18, 929 (1947); http://dx.doi.org/10.1063/1.1740889 (6 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable
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New Materials

Rev. Sci. Instrum. 18, 934 (1947); http://dx.doi.org/10.1063/1.1740890 (2 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable
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