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Mar 1942

Volume 13, Issue 3, pp. 93-134


An Improved Type of Electrically Driven High Speed Laboratory Centrifuge

E. G. Pickels

Rev. Sci. Instrum. 13, 93 (1942); http://dx.doi.org/10.1063/1.1769997 (8 pages) | Cited 2 times

Online Publication Date: 27 December 2004

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A description is given of a simple angle centrifuge which utilizes a direct universal motor drive that is capable of spinning an 8‐inch rotor at 18,000 r.p.m. with an applied potential of 180 volts and at 12,500 r.p.m. with a potential of 115 volts. Specifications and operational data are given for rotors having diameters ranging from 7 to 10¼ inches and capacities ranging from 112 to 610 cc of fluid.

Stress Analysis and Design of High Speed Angle Centrifuges

E. G. Pickels

Rev. Sci. Instrum. 13, 101 (1942); http://dx.doi.org/10.1063/1.1769984 (14 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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A detailed graphical method for determining mechanical stresses in high speed angle centrifuges is explained and equations convenient for obtaining approximate values are presented. Various points of design are discussed, and stresses have been determined for several typical rotors to serve as guides for the designer. Theoretical considerations indicate that a properly designed rotor having a diameter of 20 cm and accommodating several hundred cubic centimeters of fluid can operate at speeds up to 50,000 r.p.m. for thousands of runs.
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Erratum: Two Bridge‐Controlled Thyratron Thermostats

Dennison Bancroft

Rev. Sci. Instrum. 13, 114 (1942); http://dx.doi.org/10.1063/1.1769985 (1 page)

Online Publication Date: 27 December 2004

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Abstract Unavailable

Electronic Differentiation

Otto H. Schmitt and Walter E. Tolles

Rev. Sci. Instrum. 13, 115 (1942); http://dx.doi.org/10.1063/1.1769986 (4 pages) | Cited 3 times

Online Publication Date: 27 December 2004

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Electronic circuits are described which, over a wide range of frequency and wave form, generate output voltages accurately proportional at every instant to the time derivative of their input potentials. Three basic circuits are described which provide successively increasing accuracy of differentiation with attendant increases in complexity of construction and delicacy of adjustment. Criteria are provided for choosing between the circuits for particular applications.

A Stabilized Ionization Gauge Circuit with Vacuum Tube Voltmeter

James Rainwater

Rev. Sci. Instrum. 13, 118 (1942); http://dx.doi.org/10.1063/1.1769987 (5 pages) | Cited 10 times

Online Publication Date: 27 December 2004

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A complete control circuit for use with the usual triode ionization gauge tube is described. A modified Ridenour Lampson type circuit is employed to stabilize grid and plate voltage, as well as emission current. A simple vacuum tube voltmeter circuit permits the use of a relatively rugged 0–1 milliameter to read plate current. Special provision is made for outgassing, and for leak hunting.

An Improved Apparatus for Supersonic Velocity and Absorption Measurements

D. Telfair and W. H. Pielemeier

Rev. Sci. Instrum. 13, 122 (1942); http://dx.doi.org/10.1063/1.1769988 (5 pages) | Cited 7 times

Online Publication Date: 27 December 2004

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The value and uses of supersonic velocity and absorption measurements are reviewed, and evidence that sound velocity measurements may still be used for heat capacity determinations is presented. An apparatus which is designed for (1) a general study of acoustical dispersion, and (2) the supersonic measurement of gaseous heat capacities. The general experimental technique to be used with such an apparatus is outlined, and results of measurements of the velocity of sound in air and of the heat capacity of propylene are briefly discussed.
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Temperature Coefficients in Self‐Quenching Counters

S. A. Korff, W. D. B. Spatz, and N. Hilberry

Rev. Sci. Instrum. 13, 127 (1942); http://dx.doi.org/10.1063/1.1769989 (1 page) | Cited 3 times

Online Publication Date: 27 December 2004

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Abstract Unavailable

Specimen Holder for Powder Diffraction Samples

A. A. Burr

Rev. Sci. Instrum. 13, 127 (1942); http://dx.doi.org/10.1063/1.1769990 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Abstract Unavailable

Grid‐Controlled Corona

R. M. Ashby and A. O. Hanson

Rev. Sci. Instrum. 13, 128 (1942); http://dx.doi.org/10.1063/1.1769991 (1 page) | Cited 10 times

Online Publication Date: 27 December 2004

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Isolation of an Ultrasonic Crystal Radiator from Conducting Liquids

J. W. McGrath and A. R. Kurtz

Rev. Sci. Instrum. 13, 128 (1942); http://dx.doi.org/10.1063/1.1769992 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Abstract Unavailable

Colloidal Graphite Electrostatic Shielding

Bernard H. Porter

Rev. Sci. Instrum. 13, 129 (1942); http://dx.doi.org/10.1063/1.1769993 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Abstract Unavailable
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Erratum: A Simple Type of Flat Induction Coil

Elliot T. Benedikt

Rev. Sci. Instrum. 13, 130 (1942); http://dx.doi.org/10.1063/1.1769994 (1 page)

Online Publication Date: 27 December 2004

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Abstract Unavailable
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New Instruments

Wm. F. Roeser

Rev. Sci. Instrum. 13, 130 (1942); http://dx.doi.org/10.1063/1.1769995 (3 pages)

Online Publication Date: 27 December 2004

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New Materials

A. R. Olpin

Rev. Sci. Instrum. 13, 133 (1942); http://dx.doi.org/10.1063/1.1769996 (2 pages)

Online Publication Date: 27 December 2004

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