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Mar 1948

Volume 19, Issue 3, pp. 135-201


Infra‐Red Instrumentation and Techniques

Van Zandt Williams

Rev. Sci. Instrum. 19, 135 (1948); http://dx.doi.org/10.1063/1.1741226 (44 pages) | Cited 22 times

Online Publication Date: 20 December 2004

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Abstract Unavailable

A Rapid Method for Preparing Powder Camera Specimens with Cellulose Acetate Capillary Tubes

Karl E. Beu and Howard H. Claassen

Rev. Sci. Instrum. 19, 179 (1948); http://dx.doi.org/10.1063/1.1741227 (2 pages) | Cited 7 times

Online Publication Date: 20 December 2004

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Several details are described in the preparation of capillary tubes for x‐ray power specimens which greatly facilitate the synthesis of such tubes and their subsequent removal from the pilot wire. The over‐all method employed is essentially that of Fricke et al. Wires of 22‐gauge copper, after annealing in an atmosphere of helium, are cleaned and dipped into the cellulose acetate solution by means of a crank‐driven rack. The rate of withdrawal determines the wall thickness. A method is given for centering the filled specimen tubes precisely in the powder camera by the use of a centering jig.
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Erratum: Comparison of Glower and Globar Sources for Infra‐Red Spectrometry

R. A. Friedel and A. G. Sharkey

Rev. Sci. Instrum. 19, 180 (1948); http://dx.doi.org/10.1063/1.1741228 (1 page)

Online Publication Date: 20 December 2004

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Abstract Unavailable

An Automatic Simultaneous Equation Computer and Its Use in Solving Secular Equations

Willis A. Adcock

Rev. Sci. Instrum. 19, 181 (1948); http://dx.doi.org/10.1063/1.1741229 (7 pages) | Cited 4 times

Online Publication Date: 20 December 2004

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A feed‐back method is described which is suitable for an automatic computer solving linear simultaneous equations and secular equations. This method is more general than is the Gauss‐Siedel method. The design for an analog computer based on this feed‐back method is outlined. This design utilizes resistive voltage dividers to represent coefficients and voltages to represent the variables. The variables are automatically adjusted by the feed‐back system. The performance obtained on a 4‐equation model is given. Usually an accuracy of better than one percent is obtained.

The D.C. Thermal Characteristics of Microwave Bolometers

Edward Peskin and Ernst Weber

Rev. Sci. Instrum. 19, 188 (1948); http://dx.doi.org/10.1063/1.1741230 (8 pages) | Cited 1 time

Online Publication Date: 20 December 2004

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Abstract Unavailable
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Simple RC Equalizer Circuits

H. Logemann

Rev. Sci. Instrum. 19, 196 (1948); http://dx.doi.org/10.1063/1.1741231 (1 page)

Online Publication Date: 20 December 2004

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Abstract Unavailable
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New Instruments

W. A. Wildhack

Rev. Sci. Instrum. 19, 197 (1948); http://dx.doi.org/10.1063/1.1741232 (4 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. 19, 201 (1948); http://dx.doi.org/10.1063/1.1741233 (1 page)

Online Publication Date: 20 December 2004

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