Materials Literature
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The general method of making an evaporated multiple-layer interference filter from two dielectrics is described for any desired wave-length range. The proper thickness of each layer to give maximum reflection in the desired region and at the desired angle of incidence is first computed, and next the visible reflectivi…
This paper contains a discussion of the water-adsorption properties of a class of long-chain materials with many polar groups, which includes most textile fibers. The process discussed is distinguished from the adsorption by substances such as metal and metallic oxide catalysts in that it is not strictly a surface phe…
Abstract The molecular weight‐viscosity relationships for polystyrene are reviewed and it is recommended that the Staudinger relationship be discarded in favor of the conventional modification of it, [η] = KM a . An emulsion‐prepared polystyrene was fractionated and the viscosities and osmotic molecular weight determi…
Abstract The tensile properties of a range of pure gum natural rubbers has been reviewed, and it has been shown that their principal features can be understood on the assumption that the tensile strength measured in a given test depends directly on the amount of crystallization at break. The most important single fact…
Abstract Some of the constituent amino-acids of fibroin (degummed silk) are determined. Special attention is directed to histidine, owing to its use in the calculation of the molecular weight of fibroin. A value of 0.45 % has been found by methods in which the histidine is isolated as nitranilate or di-(3:4-dichlorobe…
Abstract General formulae are obtained for the effect of a magnetic field on the electrical and thermal conductivities of a metal in which there are two overlapping bands of normal form. Simple formulae are set up which, though not strictly valid for all temperatures and fields, reduce to the correct expressions in th…
The freezing point diagram has been plotted for mixtures of acetic acid and urotropine containing 0 to 42% urotropine. Formation of a solid compound melting at 24.8 °C., and having the approximate composition (C 6 H 12 N 4 ) 3 ∙(C 2 H 4 O 2 ) 13 is indicated. Repeated purification of the materials failed to shift the…
The resolving power of electron microscopes is limited chiefly by the fact that the spherical aberration of electron lenses of the conventional or "coreless" type can never be eliminated. In this paper a new type of electron lenses is investigated, called coaxial lenses. These contain a central cylindrical conductor,…
Four homogeneous solid solutions were found in the silver-magnesium alloy system. The α-primary solid solution of magnesium in silver has a f.c.c. structure. The β-solid solution has a b.c.c. structure. The γ-solid solution appears to have a complicated structure. While others have identified it as hexagonal, no defin…
Abstract Es wird das thermische Verhalten von Zinnmonoxyd untersucht. Im festen Zustand ist SnO unbeständig und zerfällt infolge Disproportionierung in Sn und Sn 3 O 4 nach der Gleichung: 4 SnO = Sn + Sn 3 O 4 . Dieser Zerfall wird ab etwa 400°C beobachtet, aber auch unterhalb dieser Temperatur dürfte SnO instabil sei…
A bstract The paper presents a brief résumé on the principles of electrical conductivity. Studies were made on compositions consisting mainly of oxides such as TiO 2 , Fe 2 O 3 , FesO 4 , ZrO 2 , and others. The effects of composition on the electrical resistivity and its temperature coefficient of these semiconductor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow Temperature Characteristics of ElastomersS. D. Gehman, D. E. WoodFord, and C. S. Wilkinson JrCite this: Ind. Eng. Chem. 1947, 39, 9, 1108–1115Publication Date (Print):September 1, 1947Publication History Published online1 May 2002Published inissue 1 September 1947https:/…
An analysis of the various factors involved in several typical three-layered reflection-reducing coatings has been made from both an experimental and a theoretical standpoint. By taking into account the approximate dispersions of the materials, reasonable agreement between the experimental and calculated reflection cu…
Abstract The paper describes a study of the fineness characteristics of. a wide range of fillers used in the production of bituminous road surfacings. The object of this study was to find a simple characteristic of the filler which could be directly related to the behaviour of filler‐binder mixtures, both at low fille…
The rigidity of rubber, considered as a network of flexible molecules with Gaussian configuration functions, can be calculated for a particular sample if one is given a complete description of the molecular network or certain types of statistical description. In particular, it is sufficient to know the distribution of…
A bstract The fundamental condition for glass formation is the existence of strongly bonded large networks or long chains of atoms in the liquid. Such chains or networks prevent or hinder the orderly orientation of atoms in the chains or networks themselves and also that of atoms, not in the networks in the liquid, ne…
A detailed discussion of the energy loss of negative mesotrons in matter is presented. The energy range considered is from +2000 ev to the lowest quantized orbit of the mesotron. The most important mechanism for energy loss is that of electron collisions except very near the nucleus, where radiation losses are importa…
A furnace is described for use with the electron diffraction camera for the study of chemical and physical reactions occurring on surfaces up to 1000°C. The specimens are mounted in the body of a 25 Cr-12 Ni alloy block which is surrounded by a series of radiation shields. The metal block is heated internally by a tun…
Abstract A description is given of the preparation, birefringence, and swelling capacity of a series of microscopically homogeneous, partially acetylated cellulose model filaments with an acetyl content varying from 0 to 2.3 acetyl groups per glucose residue, and obtained either by acetylation or by deacetylation. A h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Calorimetric Investigation of Moisture in Textile Fibers1aFrank C. Magne, H. J. Portas, and Helmut WakehamCite this: J. Am. Chem. Soc. 1947, 69, 8, 1896–1902Publication Date (Print):August 1, 1947Publication History Published online1 May 2002Published inissue 1 August 1947…