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Apr 1939

Volume 10, Issue 4, pp. 126-148

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A High Voltage, Demountable X‐Ray Tube

Waldo H. Kliever

Rev. Sci. Instrum. 10, 126 (1939); http://dx.doi.org/10.1063/1.1751495 (3 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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This tube consists of a minimum number of simple parts easily made in a university shop. It is designed for steady operation up to at least 110 kv, and permits convenient interchange of targets, replacement of filaments, etc.

An Electronic Phase Indicator for Electrical Balancing Machines

Douglas Marlow

Rev. Sci. Instrum. 10, 128 (1939); http://dx.doi.org/10.1063/1.1751496 (3 pages)

Online Publication Date: 27 December 2004

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The Design of an Accurate McLeod Gauge

Paul Rosenberg

Rev. Sci. Instrum. 10, 131 (1939); http://dx.doi.org/10.1063/1.1751497 (4 pages) | Cited 10 times

Online Publication Date: 27 December 2004

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All McLeod gauges heretofore constructed with large volumes and fine capillaries have failed to attain the sensitivity, precision, and accuracy which should be expected from the compression ratios. This is due to certain experimental difficulties which are enumerated. Description is given of a large McLeod gauge whose methods of construction eliminate all these difficulties and whose high sensitivity, precision, and accuracy are fully comparable to the gauge's compression ratio of 2.4×10−7. The methods of construction can be applied advantageously to small as well as to large McLeod gauges. At pressures of 10−2, 10−3, 10−4, and 10−5 mm of mercury, the precision of this gauge is 0.2, 0.6, 2, and 6 percent, respectively.

Einthoven String Galvanometer Used with a Vacuum Tube Microvoltmeter

Walter R. Miles

Rev. Sci. Instrum. 10, 134 (1939); http://dx.doi.org/10.1063/1.1751498 (3 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Thermoelectric Measurement of High Temperatures in Pressure Apparatus

Francis Birch

Rev. Sci. Instrum. 10, 137 (1939); http://dx.doi.org/10.1063/1.1751499 (4 pages) | Cited 14 times

Online Publication Date: 27 December 2004

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The effect of pressures up to 4000 kg/cm2 upon the thermal electromotive force of chromelalumel, and of platinum‐platinum‐10 percent rhodium couples has been observed for hot‐junction temperatures up to 580°C. Within this range, the electromotive force of the chromelalumel couple is independent of the pressure, to within about 10 microvolts, or one‐quarter degree. An appreciable and regular effect is found for the platinum‐rhodium couple, amounting to a decrease of the electromotive force by about 16 microvolts, or 1.8°C at 500°, for a pressure of 4000 kg/cm2. The results are presented as curves showing the decrease of electromotive force as function of temperature and pressure.

Thermal Conductance of Metallic Contacts

R. B. Jacobs and C. Starr

Rev. Sci. Instrum. 10, 140 (1939); http://dx.doi.org/10.1063/1.1751500 (2 pages) | Cited 23 times

Online Publication Date: 27 December 2004

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An Improved Magnetostriction Oscillator

W. W. Salisbury and C. W. Porter

Rev. Sci. Instrum. 10, 142 (1939); http://dx.doi.org/10.1063/1.1751501 (5 pages) | Cited 2 times

Online Publication Date: 27 December 2004

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Microvolt Potentiometer Circuit

S. C. Collins

Rev. Sci. Instrum. 10, 147 (1939); http://dx.doi.org/10.1063/1.1751502 (1 page)

Online Publication Date: 27 December 2004

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Linear Coefficient of Thermal Expansion of Ambroid

E. W. Yetter

Rev. Sci. Instrum. 10, 147 (1939); http://dx.doi.org/10.1063/1.1751503 (1 page)

Online Publication Date: 27 December 2004

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An Improved Stopcock Substitute

W. George Parks and Dayton E. Carritt

Rev. Sci. Instrum. 10, 148 (1939); http://dx.doi.org/10.1063/1.1751504 (1 page) | Cited 2 times

Online Publication Date: 27 December 2004

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Note on Making Beryllium Targets

L. C. Van Atta, A. M. Clogston, and H. O. Puls

Rev. Sci. Instrum. 10, 148 (1939); http://dx.doi.org/10.1063/1.1751505 (1 page) | Cited 1 time

Online Publication Date: 27 December 2004

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