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The discharge through flowing vapour of SiCl 4 , SnCl 4 , and SnCl 2 shows a number of regions of selective continuous emission, and, intimately connected with them, several sets of new bands. These appear under conditions unfavourable for the production of the known bands of SiCl and SnCl respectively. They are broad…
The Weiss-Heisenberg theory of ferromagnetism is discussed and generalized in a plausible way. Whether this generalization is theoretically sound must be determined by a quantum-mechanical investigation. The proposed equations of state, however, may be regarded as an attempt to describe antiferromagnetism (i.e., the c…
The methods used to measure separately the electronic and lattice heat conductivities κ e and κ g in a metal are reviewed, and it is pointed out that care is necessary in interpreting the results in view of the underlying assumptions. The equations given by Wilson for κ e and for the electrical conductivity σ are used…
A bstract X‐ray diffraction patterns were obtained for five compositions of soda‐silica glass. The patterns were made in an evacuated camera, using MoKα radiation monochromated by reflection from rock salt. The patterns show a perfectly continuous change in appearance with increasing soda content. From a Fourier analy…
Abstract In previous papers of this series evidence was advanced that: (i) The expansion which unactivated wood charcoal undergoes when adsorbing gases or vapours is directly proportional to its surface (free) energy lowering (Parts II and III). (ii) The Gibbs adsorption equation, relating the adsorption, the surface…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacities, Entropies, and Heats of Solution of Anhydrous Sod um Sulfate and of Sodium Sulfate Decahydrate. The Application of the Third Law of Thermodynamics to Hydrated CrystalsKenneth S. Pitzer and Lowell V. CoulterCite this: J. Am. Chem. Soc. 1938, 60, 6, 1310–1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivities of Urease and Pepsin MonolayersIrving Langmuir and Vincent J. SchaeferCite this: J. Am. Chem. Soc. 1938, 60, 6, 1351–1360Publication Date (Print):June 1, 1938Publication History Published online1 May 2002Published inissue 1 June 1938https://pubs.acs.org/doi/10.102…
Abstract The broadening of the X-ray diffraction lines which occurs when the crystals composing the specimen are smaller than about 10-5 cm. edge length is well known. Since the discovery of this phenomenon by Scherrer in 1920 a fair amount of work has been done on the determination of the particle size from the bread…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Electrification Due to the Recession of Aqueous Solutions from Hydrophobic SurfacesIrving LangmuirCite this: J. Am. Chem. Soc. 1938, 60, 5, 1190–1194Publication Date (Print):May 1, 1938Publication History Published online1 May 2002Published inissue 1 May 1938https://…
Abstract The essential contribution of Heisenberg to the theory of ferromagnetism was in showing that those effects which had been correlated by means of the formal molecular field hypothesis of Weiss could be interpreted as arising from interchange interaction between electrons in atoms, of the same type as that invo…
1. Isolation experiments on the egg of Sabellaria vulgaris demonstrate that the formation of the apical tuft in partial larvæ is dependent upon the presence of the first polar lobe and the C cell; that the post-trochal region develops only when the three polar lobes and the 1D cell are present; and that apical cilia f…
A method described by Trotman and Bell for the detection of damage in silk by measuring the viscosity of its solution in aqueous zinc chloride has been studied.The effect of the temperature and the time of digestion on the viscosity has been investigated, and it is shown that a higher temperature with a shorter period…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDrying Air and Commercial Gases with Activated AluminaR. B. DerrCite this: Ind. Eng. Chem. 1938, 30, 4, 384–388Publication Date (Print):April 1, 1938Publication History Published online1 May 2002Published inissue 1 April 1938https://pubs.acs.org/doi/10.1021/ie50340a005https:…
Abstract Natriumoxyd Na 2 O vereinigt sich mit vielen Salzen einfacher Sauerstoffsäuren Zu Orthosalzen, die mit NaOH oder Na 2 CO 3 nicht dargestellt werden können. So entsteht z. B. beim Erhitzen von Natriumnitrit mit, Natriumoxyd tiefgelbes Natriumorthonitrit Na 3 NO 3 , aus Natriumnitrat und Natriumoxyd bildet sich…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structures of the Hydrides of Boron. IV. B2NH7 and B3N3H6. The Structure of DimethylamineS. H. BauerCite this: J. Am. Chem. Soc. 1938, 60, 3, 524–530Publication Date (Print):March 1, 1938Publication History Published online1 May 2002Published inissue 1 March 1938https://…
The theory of order and disorder, in the form used by Bragg and Williams, is extended to arbitrary composition of the constituent elements. The work is based upon the nearest neighbor interaction assumption of Bethe and the connection between the Bethe and Bragg-Williams theory is shown. In order to extend the Bragg-W…
An attempt is made to interpret the properties of alkali halide-thallium phosphors. The experimental basis of this interpretation is the work of Pohl and his numerous collaborators on these substances. It is concluded that the long wave-length absorption peaks of the phosphors which are not contained in the pure alkal…
Abstract The crystal structure of insulin is of interest not only in itself but as part of the wider problem of protein structure considered as a whole. The early X-ray work on protein fibres gave strong support to the original chemical theories of the existence of polypeptide chains as the essential backbone of the p…
A bstract Three definite conclusions can be drawn from the X‐ray diffraction studies of vitreous silica. (1) The tetrahedral scheme of coordination, in which each silicon is tetrahedral surrounded by four oxygens and each oxygen shared between two silicons, is given directly by the Fourier analysis. (2) The liquid‐lik…
Abstract The purpose of the present paper is to provide an experimental contribution towards the knowledge of the mechanism of crystal growth from solutions. Certain details about the mechanism of crystal growth have been studied in the case of one-component systems, i. e. crystals growing from the melt or from the va…