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Jul 1934

Volume 5, Issue 7, pp. 235-262

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Physics in National Planning

Karl T. Compton

Rev. Sci. Instrum. 5, 235 (1934); http://dx.doi.org/10.1063/1.1751837 (2 pages)

Online Publication Date: 27 December 2004

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Abstract Unavailable
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An Improved Wire Grating Spectrometer for the Far Infrared

R. Bowling Barnes

Rev. Sci. Instrum. 5, 237 (1934); http://dx.doi.org/10.1063/1.1751838 (7 pages) | Cited 8 times

Online Publication Date: 27 December 2004

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A spectrometer of new design is described, which makes easier the investigation of the far infrared spectra of either solids, liquids or gases. With this instrument a very high degree of resolution has been obtained and several substances have been studied from 30μ to 180μ. From 30μ to 85μ the effective slit‐width was 1.04μ; from 85μ to 122μ, 1.67μ; and from 122μ to 180μ, 2.59μ.

A Balanced Electrometer Tube and Amplifying Circuit for Small Direct Currents

G. P. Harnwell and S. N. Van Voorhis

Rev. Sci. Instrum. 5, 244 (1934); http://dx.doi.org/10.1063/1.1751839 (4 pages) | Cited 10 times

Online Publication Date: 27 December 2004

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An extension of the DuBridge circuit is described which allows tubes of a fairly wide range of characteristics to be used. The application to the old type FP‐54 and to a tube obtained from the Bell Telephone Laboratories is described. A very stable direct‐current amplifier is also described which may be used independently for the measurement of currents of the order of 10−12 amp. or in the output of an electrometer tube circuit.

A New Technique for the Determination of Transmission Values by Means of the Hilger Rotating Sector Photometer

Andrew Dingwall, Robert G. Crosen, and Hal T. Beans

Rev. Sci. Instrum. 5, 248 (1934); http://dx.doi.org/10.1063/1.1751840 (3 pages)

Online Publication Date: 27 December 2004

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The Preparation of Specimens for the Measurement of Thermal Conductivity

John Mead Adams

Rev. Sci. Instrum. 5, 250 (1934); http://dx.doi.org/10.1063/1.1751841 (3 pages)

Online Publication Date: 27 December 2004

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The paper describes an exactly reproducible method of applying metallic coatings to the surfaces of solid specimens and of imbedding thermocouples precisely at any given depth in the coatings. The method makes possible the complete elimination of the variable discontinuity of temperature which is always present, to a greater or less degree, in measurements of thermal conductivity, between the specimen and the metallic surfaces in contact with it. A new technic for the stripping of fine silk‐covered wires is described.

Focal Isolation Versus the Monochromator for Photochemical Work in the Ultraviolet

George S. Forbes, Lawrence J. Heidt, and Laurence W. Spooner

Rev. Sci. Instrum. 5, 253 (1934); http://dx.doi.org/10.1063/1.1751842 (3 pages) | Cited 3 times

Online Publication Date: 27 December 2004

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A Ratiometer for Intensity Analyses of Microphotometer Records

G. O. Langstroth

Rev. Sci. Instrum. 5, 255 (1934); http://dx.doi.org/10.1063/1.1751843 (2 pages) | Cited 2 times

Online Publication Date: 27 December 2004

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PHYSICS NEWS

Rev. Sci. Instrum. 5, 258 (1934); http://dx.doi.org/10.1063/1.1751844 (5 pages)

Online Publication Date: 27 December 2004

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