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Dec 1939

Volume 10, Issue 12, pp. 357-390


Floyd K. Richtmyer, 1881–1939

Henry A. Barton

Rev. Sci. Instrum. 10, 357 (1939); http://dx.doi.org/10.1063/1.1751465 (4 pages)

Online Publication Date: 27 December 2004

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A Duo‐Triode Bridge Voltmeter

Richard E. Vollrath

Rev. Sci. Instrum. 10, 361 (1939); http://dx.doi.org/10.1063/1.1751466 (2 pages) | Cited 2 times

Online Publication Date: 27 December 2004

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A bridge voltmeter is described in which a duo‐triode is used in place of two separate triodes with a resulting gain in simplicity and compactness.

Use of Thermocouple and Fluxmeter for Measurement of Average Power of Irregular Waves

H. K. Dunn

Rev. Sci. Instrum. 10, 362 (1939); http://dx.doi.org/10.1063/1.1751467 (6 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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The Grassot Fluxmeter as a Quantity Meter

H. K. Dunn

Rev. Sci. Instrum. 10, 368 (1939); http://dx.doi.org/10.1063/1.1751468 (3 pages) | Cited 3 times

Online Publication Date: 27 December 2004

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A Method for Improving the Uniformity of the Central Magnetic Field in a Thick Solenoid

L. W. McKeehan

Rev. Sci. Instrum. 10, 371 (1939); http://dx.doi.org/10.1063/1.1751469 (3 pages) | Cited 6 times

Online Publication Date: 27 December 2004

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The Design of Powerful Electromagnets Part IV. The New Magnet Laboratory at M. I. T.

F. Bitter

Rev. Sci. Instrum. 10, 373 (1939); http://dx.doi.org/10.1063/1.1751470 (9 pages) | Cited 46 times

Online Publication Date: 27 December 2004

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This paper deals with the details of design and operation of air core water‐cooled coils dissipating up to 1700 kilowatts. Four magnets have been built and used. The first is intended primarily for the measurement of the magnetization of any substance at any temperature in fields up to 40,000 gauss. The second was designed to test the desirability of a new type of construction. The third gives fields up to 100,000 gauss uniform within 1 percent in a volume of 25 cc, and is to be used primarily for Zeeman effect and other optical experiments. The fourth can produce fields up to 50,000 gauss uniform within 1 percent in a volume of almost a liter, and is designed primarily for experiments at very low temperatures. The power to operate these magnets is supplied by a motor generator capable of giving 10,000 amperes at 170 volts continuously.

A Fixed Path Acoustic Interferometer for the Study of Matter

J. C. Hubbard and I. F. Zartman

Rev. Sci. Instrum. 10, 382 (1939); http://dx.doi.org/10.1063/1.1751471 (5 pages) | Cited 7 times

Online Publication Date: 27 December 2004

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The resources of ultrasonic interferometry have been extended by the development of an interferometer of fixed path. In this device a fixed distance is maintained between a piezoelectric resonator and a reflector. Variation of acoustic reaction of the medium between them is secured by a variation of the acoustic wave‐length produced by changes of temperature, pressure or composition, or in liquids and solids by a change in frequency. It is particularly adaptable to the study of the velocity of sound in gases from the lowest temperatures attainable to approximately 500°C and over a pressure range of at least 100 atmospheres because of the elimination of moving parts and packed joints. The method is also applicable, when results are obtained with two precisely known lengths of path, to the measurement of acoustic absorption and reflection coefficients. Results obtained with air and CO2 are given.

Potentiometer Circuit for Portable Optical Pyrometer

R. C. Machler

Rev. Sci. Instrum. 10, 386 (1939); http://dx.doi.org/10.1063/1.1751472 (3 pages)

Online Publication Date: 27 December 2004

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A potentiometric circuit designed for the measurement of small currents is described, together with its application to the measurement of the filament current in a portable optical pyrometer. Its feature is the elimination of several elements from the conventional potentiometer with the advantages of increased portability and simplicity of operation.
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Electrodes in Metal Vacuum Systems

Arthur Hemmendinger

Rev. Sci. Instrum. 10, 389 (1939); http://dx.doi.org/10.1063/1.1751473 (1 page) | Cited 3 times

Online Publication Date: 27 December 2004

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Vacuum Leak Testing

J. H. Manley, L. J. Haworth, and E. A. Luebke

Rev. Sci. Instrum. 10, 389 (1939); http://dx.doi.org/10.1063/1.1751474 (2 pages)

Online Publication Date: 27 December 2004

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Abstract Unavailable
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