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Dec 1938

Volume 9, Issue 12, pp. 377-433

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Physics in 1938

Thomas H. Osgood

Rev. Sci. Instrum. 9, 377 (1938); http://dx.doi.org/10.1063/1.1752373 (19 pages)

Online Publication Date: 27 December 2004

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The Associates of the Institute

H. A. B.

Rev. Sci. Instrum. 9, 396 (1938); http://dx.doi.org/10.1063/1.1752374 (1 page)

Online Publication Date: 27 December 2004

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Rounding Off Decimal Values

Rev. Sci. Instrum. 9, 397 (1938); http://dx.doi.org/10.1063/1.1752375 (1 page)

Online Publication Date: 27 December 2004

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Van de Graaff Generator for General Laboratory Use

J. G. Trump, F. H. Merrill, and F. J. Safford

Rev. Sci. Instrum. 9, 398 (1938); http://dx.doi.org/10.1063/1.1752376 (6 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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An air‐insulated direct‐current electrostatic generator of the Van de Graaff type, characterized by simplicity and low cost and suitable for a wide variety of research applications, is described. The generator, which employs re‐entrant terminals, is capable of 500 kv and produces a short‐circuit current of about 200 microamperes with a single 10″ belt. The manner in which the unit can be extended to higher voltages and currents is indicated, as well as the effect of operation in the presence of CCl4 and CCl2F2 vapors. The operating principles, design considerations, theory of multiple belts, effect of humidity, problem of surge elimination, and cost are discussed.

A Recording Spectrograph for the Far Infra‐Red

H. M. Randall and F. A. Firestone

Rev. Sci. Instrum. 9, 404 (1938); http://dx.doi.org/10.1063/1.1752377 (10 pages) | Cited 13 times

Online Publication Date: 27 December 2004

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This spectrograph records upon sheets of photographic paper 20×30 inches in size, spectra lying in the range between 18μ and 200μ. Of this range, 9μ may be spread over a single record, or as much as 100μ may be covered, depending upon the gratings and the adjustments used. The spectrograph is a vacuum instrument of high resolving power, being capable of separating sharp lines somewhat closer than 0.5 cm−1 apart. Detailed drawings of its construction together with several records are shown and described. The recorded galvanometer deflections are usually adjusted to lie between 100 and 300 mm.

A Tubular Vacuum‐Type Centrifuge

J. W. Beams

Rev. Sci. Instrum. 9, 413 (1938); http://dx.doi.org/10.1063/1.1752378 (4 pages) | Cited 9 times

Online Publication Date: 27 December 2004

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A method of spinning tubular rotors to high speeds in a vacuum is described. The rotors are spun by air‐supported, air‐driven turbines situated below the vacuum chamber. The maximum rotational speed attainable is set only by the bursting strength of the tubular rotor. The material to be centrifuged enters the spinning tube at the top at a continuous rate and is collected in light and heavy fractions at the bottom. The apparatus has been used for centrifuging materials in gaseous, vapor and liquid states.

A Radiometer‐Type Vacuum Gauge

Arthur E. Lockenvitz

Rev. Sci. Instrum. 9, 417 (1938); http://dx.doi.org/10.1063/1.1752379 (4 pages) | Cited 5 times

Online Publication Date: 27 December 2004

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A radiometer‐type vacuum gauge is described, which is rugged and simple to construct, which can be calibrated from the dimensions of the gauge, and for which the temperature of the moving system does not enter. The gauge, when constructed entirely of metal has a range from 2 dynes per square centimeter to 0.01 dyne per square centimeter. If constructed of glass, the lower limit can be extended to 0.001 dyne per square centimeter or better.

A Device to Protect Large Vacuum Systems Against Accidental Interruptions of the Mechanical Pump

J. Paul Youtz

Rev. Sci. Instrum. 9, 420 (1938); http://dx.doi.org/10.1063/1.1752380 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Photoelectrically Balanced Recording Potentiometer

C. Owen Fairchild and V. Lawrence Parsegian

Rev. Sci. Instrum. 9, 422 (1938); http://dx.doi.org/10.1063/1.1752381 (4 pages) | Cited 3 times

Online Publication Date: 27 December 2004

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The problem of stopping a moving light‐beam on the edge of a phototube without any tendency to oscillate or ``hunt,'' and with speed and precision has been solved by a new method and a recording potentiometer is rapidly and accurately balanced. By (1) artificially canceling the generated back e.m.f. of the moving galvanometer thus advancing its return movement from a deflected position, and (2) delaying the grid potential change of a triode amplifier in the photoelectric circuit, galvanometer lag is counteracted and the potentiometer is balanced with an accuracy of a few hundredths of a percent of the range. The total power input to the instrument is about 35 watts and the contact carriage speed is made as high as 10″ in 20 seconds.1 The fundamentals of the complete instrument are discussed and equations describing the galvanometer movement are included.

A Vacuum Furnace for the Production of Single Crystals of Metals and Alloys

Foster C. Nix

Rev. Sci. Instrum. 9, 426 (1938); http://dx.doi.org/10.1063/1.1752382 (2 pages) | Cited 7 times

Online Publication Date: 27 December 2004

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Note on Making Beryllium Targets

H. R. Crane

Rev. Sci. Instrum. 9, 428 (1938); http://dx.doi.org/10.1063/1.1752383 (1 page) | Cited 2 times

Online Publication Date: 27 December 2004

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Greaseless Vacuum Valves

Chas. H. Townes

Rev. Sci. Instrum. 9, 428 (1938); http://dx.doi.org/10.1063/1.1752384 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Stabilized Regenerative Amplifier

Shepard Roberts

Rev. Sci. Instrum. 9, 429 (1938); http://dx.doi.org/10.1063/1.1752385 (1 page) | Cited 1 time

Online Publication Date: 27 December 2004

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A Simplified Construction of Hull‐Davey Charts

Robert A. Harrington

Rev. Sci. Instrum. 9, 429 (1938); http://dx.doi.org/10.1063/1.1752386 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Simple Protective Device for Water‐Cooled Apparatus

S. Town Stephenson

Rev. Sci. Instrum. 9, 430 (1938); http://dx.doi.org/10.1063/1.1752387 (1 page)

Online Publication Date: 27 December 2004

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PHYSICS NEWS

Rev. Sci. Instrum. 9, 432 (1938); http://dx.doi.org/10.1063/1.1752388 (2 pages)

Online Publication Date: 27 December 2004

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Abstract Unavailable
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