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Dec 1959

Volume 30, Issue 12, pp. 1087-1136


Logarithmic Characteristic of Triode Electrometer Circuits

Stanley K. Chao

Rev. Sci. Instrum. 30, 1087 (1959); http://dx.doi.org/10.1063/1.1716450 (6 pages) | Cited 2 times

Online Publication Date: 29 December 2004

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The triode‐connected 5889 electrometer tube was found to be useful as a logarithmic element over a grid current range of 10−14 to 10−6 amp. The relationship of plate current to grid current was carefully studied over a span of three and one‐half decades as a function of the plate supply potential, the plate circuit load resistance, and the filament voltage. A circuit was developed for use in an ionization chamber survey instrument. Most 5889 tubes will work in the circuit after a 150‐hr aging period. Over‐all accuracy of ±10% of the reading is feasible.

Mass Spectrometer Leak Detector with Improved Sensitivity

John L. Peters

Rev. Sci. Instrum. 30, 1093 (1959); http://dx.doi.org/10.1063/1.1716451 (3 pages) | Cited 2 times

Online Publication Date: 29 December 2004

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A new type of mass spectrometer leak detector is described which has a sensitivity for helium of 10−13 standard cc∕sec with a signal‐to‐noise ratio of unity. Operating pressure is in the 10−5 to 10−6 mm Hg range, time for ⅔ of final response is 2 sec or less, and operating characteristics are similar to present helium‐sensitive mass spectrometer leak detectors.

Linearly Biased Track Counting in Cross‐Section Determinations

Frank S. Crawford

Rev. Sci. Instrum. 30, 1096 (1959); http://dx.doi.org/10.1063/1.1716452 (2 pages) | Cited 2 times

Online Publication Date: 29 December 2004

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In determining the average number n of tracks per bubble chamber picture, for purposes of determining cross sections, one usually cannot count all tracks, but counts tracks in only some of the pictures, selected at random. An alternative procedure is described here in which the pictures are not selected at random, but are those which contain the ``interesting events.'' The average of 1∕n over this ``linearly biased'' sample equals 1∕n, where n is the desired average over a random sample.
The linear‐bias method has some advantages that are complementary to those of the usual random method.

Simplified Logarithmic Radiation Meter Using Noise

Charles Erwin Cohn

Rev. Sci. Instrum. 30, 1097 (1959); http://dx.doi.org/10.1063/1.1716453 (3 pages)

Online Publication Date: 29 December 2004

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See Also: Erratum

Show Abstract
A logarithmic radiation meter has been developed which uses an ac‐coupled logarithmic voltmeter to measure the random noise from a photomultiplier detector. A range of four decades has been obtained.

Probability Density Measurement with an Electrode Mounted in the Face of a Cathode‐Ray Tube

Hwachii Lien

Rev. Sci. Instrum. 30, 1100 (1959); http://dx.doi.org/10.1063/1.1716454 (3 pages) | Cited 2 times

Online Publication Date: 29 December 2004

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A small electrode mounted inside the face of a cathode‐ray tube gives a ``window'' comparable to its own dimensions when the bias voltages are set so that secondary electron emission current dominates. Under these conditions the device can be used for measurement of probability densities of random signals.

Pulse‐Height Analyzer for Neuro‐Physiological Applications

R. M. Littauer and C. Walcott

Rev. Sci. Instrum. 30, 1102 (1959); http://dx.doi.org/10.1063/1.1716455 (5 pages) | Cited 4 times

Online Publication Date: 29 December 2004

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A five‐channel differential pulse‐height analyzer is described, designed specifically for the observation of action potentials in nerve fibers. By measurement of the pulse amplitudes, it is possible to follow the activity of one or more single nerve fibers continuously.

Equipment for ''Watching'' Propagating Stress Waves

Herbert Bfcker

Rev. Sci. Instrum. 30, 1107 (1959); http://dx.doi.org/10.1063/1.1716456 (3 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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The propagation of stress waves generated by impact may be ``watched'' photoelastically with the use of the simple experimental arrangement described herein. In addition to providing control over the observed progress of the wave, the apparatus makes possible photography of the wave with conventional cameras. The equipment not only is a scientific instrument, but also provides a useful demonstration for instructional purposes.

Transistorized Distributed Amplifier

Charles W. McMullen

Rev. Sci. Instrum. 30, 1109 (1959); http://dx.doi.org/10.1063/1.1716457 (5 pages)

Online Publication Date: 29 December 2004

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Some analytical and experimental results are given for a transistorized distributed amplifier using the common emitter configuration. The characteristic impedances of the base and collector transmission lines are both 43.4Ω. A 4‐section amplifier stage yields a mid‐frequency gain of 5.1 db and an upper half‐power frequency of 290 Mc. The low‐frequency response is reasonably constant down to 10 cps.

Handling of Extremely Thin Wollaston Wires

Herbert J. Bomelburg

Rev. Sci. Instrum. 30, 1114 (1959); http://dx.doi.org/10.1063/1.1716458 (2 pages)

Online Publication Date: 29 December 2004

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A reliable method of etching and mounting Wollaston wires is described. The method involves attaching one end of the wire to a specially prepared ceramic tube, dipping the pendant portion of the wire into an etching solution, and then after etching is completed, attaching the loose end of the wire to the ceramic tube, and finally, firing the tube and mounted wire to 1000°F. The thinnest wires handled by this method had diameters of 0.5 μ and lengths of 2 mm.

Wagner‐Earth and Other Null Instrument Capacity Neutralizing Circuits

Hanns H. Wolff

Rev. Sci. Instrum. 30, 1116 (1959); http://dx.doi.org/10.1063/1.1716459 (7 pages) | Cited 3 times

Online Publication Date: 29 December 2004

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A simple but exact derivation of the conditions for ground potential on the null instrument input in nongrounded ac bridges is given. It is shown that not only the ``Wagner‐earth,'' but also other networks and circuits between the power source and the ac bridge can easily fulfill these conditions. Advantages of such other networks and circuits are discussed. General considerations for optimum bridge details for measurements of highest obtainable accuracy are given. Practical supply circuits for ac bridges are described. Furthermore, it is shown how the adjustment of the earth capacity neutralizing system can be made in a minimum amount of time.

Magnetic Susceptibility Balance Using a Null Technique

J. R. Singer

Rev. Sci. Instrum. 30, 1123 (1959); http://dx.doi.org/10.1063/1.1716460 (2 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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A very sensitive magnetic susceptibility balance is described with the characteristic of providing a null reading over all field strengths whenever the sample is purely paramagnetic. The balance is used mainly for single crystal measurements of susceptibility at high and low temperatures. Any ferromagnetic impurity shows as a null deviation as the magnetic field strength is altered. The degree of unbalance obtained is readily used to subtract out the ferromagnetic impurity from the paramagnetic or antiferromagnetic components of the susceptibility.
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Underwater Camera Positioning by Sonar

Harold E. Edgerton and Jacques Y. Cousteau

Rev. Sci. Instrum. 30, 1125 (1959); http://dx.doi.org/10.1063/1.1716461 (2 pages) | Cited 5 times

Online Publication Date: 29 December 2004

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Abstract Unavailable

Rotating Sample Holder for Microscopic Observation of Whiskers

Paul J. Bryant and Paul L. Gutshall

Rev. Sci. Instrum. 30, 1126 (1959); http://dx.doi.org/10.1063/1.1716462 (2 pages)

Online Publication Date: 29 December 2004

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Abstract Unavailable

Plastic Microwave Cavities for EPR

P. F. Chester, P. E. Wagner, J. G. Castle, and G. Conn

Rev. Sci. Instrum. 30, 1127 (1959); http://dx.doi.org/10.1063/1.1716463 (2 pages) | Cited 13 times

Online Publication Date: 29 December 2004

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Abstract Unavailable

Mechanical Differentiator

M. J. Hellman, J. W. Liskowitz, and B. Carroll

Rev. Sci. Instrum. 30, 1128 (1959); http://dx.doi.org/10.1063/1.1716464 (1 page) | Cited 2 times

Online Publication Date: 29 December 2004

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Abstract Unavailable

New Liquid Scintillant

H. A. Miranda and H. Schimmel

Rev. Sci. Instrum. 30, 1128 (1959); http://dx.doi.org/10.1063/1.1716465 (2 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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Abstract Unavailable

Selected Area Laue Back‐Reflection X‐Ray Camera and Procedure

P. S. Rudman and B. Weiss

Rev. Sci. Instrum. 30, 1129 (1959); http://dx.doi.org/10.1063/1.1716466 (2 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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Abstract Unavailable

Scintillations from Liquid Helium

H. Fleishman, H. Einbinder, and C. S. Wu

Rev. Sci. Instrum. 30, 1130 (1959); http://dx.doi.org/10.1063/1.1716467 (2 pages) | Cited 9 times

Online Publication Date: 29 December 2004

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Abstract Unavailable

Strong‐Focusing Ion Source

Earl T. Kinzer and Howard Carr

Rev. Sci. Instrum. 30, 1132 (1959); http://dx.doi.org/10.1063/1.1716468 (1 page) | Cited 5 times

Online Publication Date: 29 December 2004

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Abstract Unavailable

Thermoelectric Thermostat for X‐Ray Diffraction

R. A. Horne, W. J. Croft, and L. B. Smith

Rev. Sci. Instrum. 30, 1132 (1959); http://dx.doi.org/10.1063/1.1716469 (3 pages) | Cited 2 times

Online Publication Date: 29 December 2004

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Acceleration of Polarized Protons with Strong‐Focusing Linear Accelerators

David Cohen and Alan J. Burger

Rev. Sci. Instrum. 30, 1134 (1959); http://dx.doi.org/10.1063/1.1716470 (2 pages) | Cited 1 time

Online Publication Date: 29 December 2004

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Abstract Unavailable

Glass Scintillators for Neutron Detection

L. M. Bollinger, G. E. Thomas, and R. G. Ginther

Rev. Sci. Instrum. 30, 1135 (1959); http://dx.doi.org/10.1063/1.1716471 (2 pages) | Cited 8 times

Online Publication Date: 29 December 2004

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Abstract Unavailable
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