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Dec 1946

Volume 17, Issue 12, pp. 529-563


Our Contributions to International Relations in Physics

Henry A. Barton

Rev. Sci. Instrum. 17, 529 (1946); http://dx.doi.org/10.1063/1.1770421 (4 pages)

Online Publication Date: 17 December 2004

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Design of a Proportional Counter for Gamma‐Rays

Bruce B. Benson

Rev. Sci. Instrum. 17, 533 (1946); http://dx.doi.org/10.1063/1.1770422 (4 pages) | Cited 9 times

Online Publication Date: 17 December 2004

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The design and details of construction of a proportional counter for use in counting gammarays in the high proportional region are described. The circuit diagrams for the preamplifier, the main video amplifier, and the stabilized high voltage supply are included. The counter is operated with pure argon, or with argon plus a little air, at 50‐cm pressure and about 1750 volts. When used with a coincidence circuit, employing blocking oscillators for sharpening the pulses, a resolving time of 4×10−8 second is obtained.

A Visual Null Indicator for Impedance Bridge Measurements at Radiofrequencies

P. J. Brine and J. W. Whitehead

Rev. Sci. Instrum. 17, 537 (1946); http://dx.doi.org/10.1063/1.1770423 (3 pages) | Cited 1 time

Online Publication Date: 17 December 2004

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With this cathode‐ray null indicator, impedance measurements made with a bridge such as the General Radio Type 916A can be determined to an accuracy of 0.2 ohm in the presence of interference at levels exceeding 40 db above 1 microvolt.

A Method for Controlling Scattered Radiation in Obtaining X‐Ray Absorption Data by Photographic Means

H. E. Seemann and L. L. MacGillivray

Rev. Sci. Instrum. 17, 539 (1946); http://dx.doi.org/10.1063/1.1770425 (4 pages) | Cited 1 time

Online Publication Date: 17 December 2004

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Errors caused by scattered radiation in photographic x‐ray absorption measurements can be materially reduced by (1) irradiating a minimum amount of matter, (2) placing the absorbing material some distance from the film, and (3) keeping the different filter elements separated by lead partitions so that scattering cannot spread indefinitely. These conditions have been met by the use of a lead chamber made up of several parallel longitudinal compartments. Filters differing in thickness are placed over holes in the end where the x‐rays enter and recording films are located at the exit end. This system has the further advantage that all filters are exposed simultaneously, thus promoting accuracy in relative absorption measurements, particularly when short exposure times only are possible. Experimental results show that, in a particular design, 97 percent of the scattering is eliminated.

Characteristics of the Pre‐Corona Discharge and Its Use as a Reference Potential in Voltage Stabilizers

Sanborn C. Brown

Rev. Sci. Instrum. 17, 543 (1946); http://dx.doi.org/10.1063/1.1770426 (7 pages) | Cited 1 time

Online Publication Date: 17 December 2004

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The characteristics of a pre‐corona discharge are studied. The high sensitivity of the current to changes in voltage make possible the application of such a discharge as a reference potential for electronic voltage stabilizers. The use of a stabilizing diode operating in the pre‐corona region, where the discharge is maintained by ionization external to the discharge, is discussed. Characteristics of a high impedance electronic voltage stabilizer controlled by a pre‐corona discharge diode appear to be very satisfactory.

Panoramic Mass Spectrometer Observation

A. Theodore Forrester and Wilfrid B. Whalley

Rev. Sci. Instrum. 17, 549 (1946); http://dx.doi.org/10.1063/1.1770427 (4 pages) | Cited 4 times

Online Publication Date: 17 December 2004

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In order to facilitate mass spectrometer observation, a low frequency scanning system was used to obtain mass‐current curves on the face of an oscilloscope tube. The maximum sensitivity obtained was 5×10−14 amp. per cm vertical deflection. This was limited by the input capacity, the sweep frequency, and the available amplification.
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A Versatile Square Wave Nerve Stimulator

Arthur C. Guyton

Rev. Sci. Instrum. 17, 553 (1946); http://dx.doi.org/10.1063/1.1770428 (4 pages)

Online Publication Date: 17 December 2004

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1. A square wave stimulator with an extreme range of voltage, duration, and frequency of stimuli is described. 2. The stimulator is coupled directly to the electrodes, thereby preventing distortion of the square wave. 3. This stimulator makes possible the rapid measurement of time and duration of stimulus necessary to cause a nerve response. For routine laboratory work, it is extremely convenient to use.
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Thin‐Walled Plastic Capillaries for X‐Ray Diffraction Use

Jerry M. Waite

Rev. Sci. Instrum. 17, 557 (1946); http://dx.doi.org/10.1063/1.1770429 (1 page) | Cited 4 times

Online Publication Date: 17 December 2004

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Abstract Unavailable

A Recycling Time‐Delay Device

A. H. Taylor

Rev. Sci. Instrum. 17, 557 (1946); http://dx.doi.org/10.1063/1.1770430 (1 page)

Online Publication Date: 17 December 2004

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Abstract Unavailable

High Temperature X‐Ray Diffraction Camera

Frank G. Chesley

Rev. Sci. Instrum. 17, 558 (1946); http://dx.doi.org/10.1063/1.1770431 (1 page) | Cited 4 times

Online Publication Date: 17 December 2004

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Abstract Unavailable
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New Instruments

New Instruments

W. A. Wildhack

Rev. Sci. Instrum. 17, 558 (1946); http://dx.doi.org/10.1063/1.1770432 (5 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable
New Materials

New Materials

Forest K. Harris

Rev. Sci. Instrum. 17, 563 (1946); http://dx.doi.org/10.1063/1.1770433 (1 page)

Online Publication Date: 17 December 2004

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