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1 Jul 1937

Volume 8, Issue 7, pp. 449-510


Science, Invention and Society

Waldemar Kaempffert

J. Appl. Phys. 8, 449 (1937); http://dx.doi.org/10.1063/1.1710320 (6 pages)

Online Publication Date: 13 April 2004

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Abstract Unavailable

Physics in The Paper Industry

E. W. Samson

J. Appl. Phys. 8, 455 (1937); http://dx.doi.org/10.1063/1.1710321 (7 pages)

Online Publication Date: 13 April 2004

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Abstract Unavailable

The Physics of Subsidence and Ground Movement in Coal Mines

H. P. Greenwald

J. Appl. Phys. 8, 462 (1937); http://dx.doi.org/10.1063/1.1710322 (8 pages) | Cited 1 time

Online Publication Date: 13 April 2004

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Abstract Unavailable

Trilinear Coordinates

Howard Aiken

J. Appl. Phys. 8, 470 (1937); http://dx.doi.org/10.1063/1.1710324 (3 pages)

Online Publication Date: 13 April 2004

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Abstract Unavailable

Physics of Air Hygiene

H. B. Meller and F. F. Rupert

J. Appl. Phys. 8, 473 (1937); http://dx.doi.org/10.1063/1.1710325 (6 pages)

Online Publication Date: 13 April 2004

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Abstract Unavailable

Impregnation Studies with Colloidal Graphite

Bernard H. Porter

J. Appl. Phys. 8, 479 (1937); http://dx.doi.org/10.1063/1.1710326 (4 pages)

Online Publication Date: 13 April 2004

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Abstract Unavailable
FREE

Erratum: The Liquid State

J. Appl. Phys. 8, 482 (1937); http://dx.doi.org/10.1063/1.1710327 (1 page)

Online Publication Date: 13 April 2004

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Abstract Unavailable

The Use of the A.S.T.M. Penetration Equipment for Estimating the Viscosities of Materials of High Consistency

E. O. Rhodes and E. W. Volkmann

J. Appl. Phys. 8, 492 (1937); http://dx.doi.org/10.1063/1.1710328 (4 pages) | Cited 3 times

Online Publication Date: 13 April 2004

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In a recent publication Thelen described experiments in which the standard penetrometer was used to determine the flow‐shear diagrams for a number of asphalts. On the basis of these diagrams Thelen calculated viscosities which are of different magnitude from those expected from Saal's formula. In the present paper certain fallacies in Thelen's deductions are pointed out. A new method for analyzing Thelen's experimental results is shown which makes it possible to calculate absolute viscosities from penetration readings for a series of successive time intervals. The method is based upon the determination of viscosity by axial displacement of concentric vertical cylinders. Since the conditions under which viscosity can be determined by axial displacement are only approximated in the penetration test the new method cannot be expected to have a high degree of accuracy. Nevertheless from successive penetration readings on a coal tar pitch (penetration 100 g, 5 sec. at 25°C) an average viscosity of 383,000 poises was calculated which closely agrees with the value of 380,000 determined by a capillary rise viscometer. The viscosity as calculated from the initial penetration reading by the Saal formula was 355,000 poises.

Fundamental Mechanisms Which Determine the Starting Potentials of the Low Pressure Corona Discharge

Leonard B. Loeb

J. Appl. Phys. 8, 495 (1937); http://dx.doi.org/10.1063/1.1710329 (2 pages) | Cited 1 time

Online Publication Date: 13 April 2004

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Abstract Unavailable

The Effects of Elastic Stretch on the Infrared Spectrum of Rubber

Dudley Williams and Richard Taschek

J. Appl. Phys. 8, 497 (1937); http://dx.doi.org/10.1063/1.1710330 (9 pages) | Cited 9 times

Online Publication Date: 13 April 2004

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The absorption spectrum of stretched rubber has been studied in the region between 2μ and 8μ. In the case of unilateral stretch transmission measurements indicate that the absorption bands near 3.3μ and 7μ become broader with increasing stretch while the general background absorption becomes more pronounced. Radial stretch was found to produce similar effects in the 3.3μ and 7μ regions while the bands near 6μ became less intense for both unilateral and radial stretch. In the spectrum of rubber stretched radially to approximately twelve times its original area a band was observed near 4.8μ in a region where there is no intense absorption in the unstretched material. Since both absorption and reflection are involved in transmission measurements, it was necessary to determine reflection and extinction coefficients. The results indicate that the reflection coefficient diminishes and the extinction coefficient increases with increasing stretch. The observed variations in the extinction coefficients are of greater magnitude than those to be expected from the known density changes which accompany stretching.

The Viscosity of Raw Rubber

Hugh M. Smallwood

J. Appl. Phys. 8, 505 (1937); http://dx.doi.org/10.1063/1.1710331 (6 pages) | Cited 11 times

Online Publication Date: 13 April 2004

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Eyring's reaction rate theory of the viscosity of simple and of non‐Newtonian liquids has been outlined. Mooney's data on the rheology of a sample of raw rubber have been shown to be in agreement with Eyring's theory. The data have been discussed from the viewpoint of the theory, and some conclusions have been drawn concerning the probable mechanism of viscous flow in raw rubber.
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