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Mar 1934

Volume 5, Issue 3, pp. 115-142

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Current History of the Positive Electron

Karl K. Darrow

Rev. Sci. Instrum. 5, 115 (1934); http://dx.doi.org/10.1063/1.1751806 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Abstract Unavailable
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A Gas X‐Ray Tube

Gunnar Hägg

Rev. Sci. Instrum. 5, 117 (1934); http://dx.doi.org/10.1063/1.1751807 (2 pages) | Cited 3 times

Online Publication Date: 27 December 2004

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A Note on the Use of Sealed Alpha‐Ray Bulbs in the Study of Chemical Reactions Produced by Radon

E. C. Truesdale and C. H. Shiflett

Rev. Sci. Instrum. 5, 119 (1934); http://dx.doi.org/10.1063/1.1751808 (1 page)

Online Publication Date: 27 December 2004

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Note on the Resonance Radiometer

J. D. Hardy

Rev. Sci. Instrum. 5, 120 (1934); http://dx.doi.org/10.1063/1.1751809 (5 pages) | Cited 5 times

Online Publication Date: 27 December 2004

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Experimental evidence in support of Van Lear's theory concerning the Brownian error of the resonance radiometer is given with photographic records showing the character of the baseline unsteadiness. A comparison between critically damped galvanometer systems and the resonance radiometer from an experimental point of view is offered.

Evaporation Technique for Highly Refractory Substances

H. M. O'Bryan

Rev. Sci. Instrum. 5, 125 (1934); http://dx.doi.org/10.1063/1.1751810 (2 pages) | Cited 10 times

Online Publication Date: 27 December 2004

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Platinum, boron, molybdenum, quartz and other substances have been evaporated in vacuum from a crucible heated by bombardment with electrons at 4000 volts from a tungsten filament. A small pure graphite crucible was heated to its melting point about 3500°C by 100 milliamperes of electron current. Most elements will alloy with a tantalum or molybdenum crucible so a graphite cup is usually preferable. Low melting point substances which would easily alloy with a tungsten filament can be readily handled by this method, which has been used in the preparation of x‐ray target surfaces, small mirrors and absorbing films.

Constant Ultraviolet Output from Quartz Mercury Arc Lamps

William T. Anderson

Rev. Sci. Instrum. 5, 127 (1934); http://dx.doi.org/10.1063/1.1751811 (3 pages)

Online Publication Date: 27 December 2004

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An Optical Osmometer

C. H. Dwight and H. Kersten

Rev. Sci. Instrum. 5, 130 (1934); http://dx.doi.org/10.1063/1.1751812 (2 pages)

Online Publication Date: 27 December 2004

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An osmometer is described which makes use of an optical lever for measuring rapid changes in volume of a solution in osmosis, and which is capable of being read at a distance and of magnifying the readings.

ABSTRACTS OF INSTRUMENTS LITERATURE

Rev. Sci. Instrum. 5, 132 (1934); http://dx.doi.org/10.1063/1.1751813 (6 pages)

Online Publication Date: 27 December 2004

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PHYSICS NEWS

Rev. Sci. Instrum. 5, 139 (1934); http://dx.doi.org/10.1063/1.1751814 (4 pages)

Online Publication Date: 27 December 2004

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