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May 1940

Volume 11, Issue 5, pp. 159-182

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A Simplified High Sensitivity Photometer or Exposure Meter for Photographic Enlarging

Walter van B. Roberts

Rev. Sci. Instrum. 11, 159 (1940); http://dx.doi.org/10.1063/1.1751670 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Abstract Unavailable

Luminous and High Resolving Universal X‐Ray Spectrograph

E. Ingelstam

Rev. Sci. Instrum. 11, 160 (1940); http://dx.doi.org/10.1063/1.1751671 (5 pages) | Cited 2 times

Online Publication Date: 27 December 2004

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A universal spectrograph combining the concave‐crystal methods by internal and external reflection has been constructed. The crystal employed covers the wave‐length domain 0–2300 x.u. The aim was to get a convenient instrument suitable for rapid work. Direct wave‐length reading is possible. Technical improvements in the crystal holder have been made.

Admission of Pure Gases to Vacuum Systems

E. Leonard Jossem

Rev. Sci. Instrum. 11, 164 (1940); http://dx.doi.org/10.1063/1.1751672 (3 pages) | Cited 4 times

Online Publication Date: 27 December 2004

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The Application of the Method of Coincidence Counting to Experiments in Nuclear Physics

J. V. Dunworth

Rev. Sci. Instrum. 11, 167 (1940); http://dx.doi.org/10.1063/1.1751673 (14 pages) | Cited 59 times

Online Publication Date: 27 December 2004

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The paper describes the principles involved in the application of coincidence counting to problems in nuclear physics, and gives details of the various methods of approach to the solution of nuclear level schemes, with some of the difficulties encountered. It is shown that the maximum source strength which can be used is inversely proportional to the coincidence resolving time and that the method of experiment has the great advantage over most other methods in that it can be used with very weak sources (sources having an activity of about 10−5 millicurie). An accurate knowledge of the absolute net efficiency of a Geiger counter for all types of radiation is required in the interpretation of the coincidence rates, and the method of achieving this at the same time as information is obtained about nuclear level schemes is explained. Further, it is pointed out that the method makes possible a simple and rapid determination of the total energy of disintegration of β‐radioactive nuclei and therefore of the mass differences between parent and daughter nuclei.
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A Method for Opening a Tube in a Vacuum

James J. Brady

Rev. Sci. Instrum. 11, 181 (1940); http://dx.doi.org/10.1063/1.1751674 (1 page)

Online Publication Date: 27 December 2004

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Note on a D.C. Amplifying Microammeter

Lawrence M. Langer and Franz N. D. Kurie

Rev. Sci. Instrum. 11, 181 (1940); http://dx.doi.org/10.1063/1.1751675 (2 pages)

Online Publication Date: 27 December 2004

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Amplifier Voltage Supply

E. G. Witting

Rev. Sci. Instrum. 11, 182 (1940); http://dx.doi.org/10.1063/1.1751676 (1 page) | Cited 1 time

Online Publication Date: 27 December 2004

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