Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on Glass. VG. S. ParksG. S. ParksMore by G. S. Parks, S. B. ThomasS. B. ThomasMore by S. B. Thomas, and W. A. GilkeyW. A. GilkeyMore by W. A. GilkeyCite this: J. Phys. Chem. 1930, 34, 9, 2028–2034Publication Date (Print):September 1, 1930Publication History Published…
Abstract It was shown in the preceding work that a very dilute solution of balata in an organic solvent contains macromolecules in solution and not micelles. The same is true of rubber. On the basis of these findings it is possible to calculate the molecular weight of rubber and balata from viscosity measurements by m…
The changes of size of iron and nickel at their Curie points are too great to be explained by purely magnetic forces. On Heisenberg's theory of ferromagnetism, magnetization is accompanied by a change in the strength of binding between atoms, and the resulting changes of size of crystals of iron and nickel at their Cu…
The process of magnetization must consist of two parts, first the switching over of the magnetization in small elements of volume from one direction of easiest magnetization to another, and then a gradual change from this direction to that of the applied field. These two stages involve different distortions of the cry…
The pore space in an assemblage of uniform spheres was initially filled with liquid. After very slow drainage the amount of liquid retained by the spheres was experimentally measured. The liquid is retained in the form of rings at the contacts of adjacent spheres. The radii of curvature of the ring surfaces are comput…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSTUDIES ON POLYMERIZATION AND RING FORMATION. V. GLYCOL ESTERS OF OXALIC ACIDWallace H. Carothers, J. A. Arvin, and G. L. DoroughCite this: J. Am. Chem. Soc. 1930, 52, 8, 3292–3300Publication Date (Print):August 1, 1930Publication History Published online1 May 2002Published…
Conditions that are necessary for the precipitation and ignition of magnesium ammonium phosphate, MgNH4P04-6H 2 0, in determinations of phosphorus or magnesium are described, and the temperatures at which the precipitates should be heated to obtain the most reliable results have been determined. In addi- tion, observa…
This paper describes a simple method for specifying the slipperiness of fabrics, by measurement of the coefficient of friction between two pieces of the same material.
In analogy with the method of Zener for the atoms from Li to F, simple rules are set up giving approximate analytic atomic wave functions for all the atoms, in any stage of ionization. These are applied to x-ray levels, sizes of atoms and ions, diamagnetic susceptibility, etc. In connection with ferromagnetism it is s…
The relation between the frequency of hard radiations and the absorption coefficient is not experimentally well established at the present time. In order to obtain definite information it is necessary to use a radiation with high homogeneity. γ-Rays from ThC” are found to fulfill this requirement. Investigations of th…
ABSTRACT This paper includes a triaxial diagram for the potash series, containing two good glass areas in contrast with a single area in the soda series. One area is in the region of low beryllia and high silica; the other in the region of high beryllia and low silica. The latter contains the better glasses. Areas are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE HEAT CAPACITY OF SILICON AT LOW TEMPERATURES1C. Travis AndersonCite this: J. Am. Chem. Soc. 1930, 52, 6, 2301–2304Publication Date (Print):June 1, 1930Publication History Published online1 May 2002Published inissue 1 June 1930https://pubs.acs.org/doi/10.1021/ja01369a017h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTACTION OF TITANIUM TETRACHLORIDE ON DERIVATIVES OF SUGARS. II. PREPARATION OF TETRA-ACETYL-BETA-NORMAL-HEXYLGLUCOSIDE AND ITS TRANSFORMATION TO THE ALPHA FORM1,2Eugen PacsuCite this: J. Am. Chem. Soc. 1930, 52, 6, 2563–2567Publication Date (Print):June 1, 1930Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetallic Soaps—Their Uses, Preparation, and PropertiesWillet F. Whitmore and Michael LauroCite this: Ind. Eng. Chem. 1930, 22, 6, 646–649Publication Date (Print):June 1, 1930Publication History Published online1 May 2002Published inissue 1 June 1930https://pubs.acs.org/doi/1…
Abstract Graphitsäure ist ein chemisch wohldefinierter Stoff, in welchem das Verhältnis von Kohlenstoff zu Sauerstoff zu Wasserstoff wie 2:1:1 ist. Ihrer Entstehung, ihren Eigenschaften und ihrem ganzem Verhalten nach kommt ihr die Formel C 6 0 3 H 3 oder besser C 6 (OH) 3 zu. Die Kohlenstoffatome sind wie im Ausgangs…
Abstract Object of Experiment.—From the results of a previous experiment on a single crystal of zinc, it was concluded that the formation of twins in zinc occurred on planes of the 101ˉ2 type and that the particular operative twinning plane (of the six available) was determined chiefly by the direction of slip on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE ISOLATION AND IDENTIFICATION OF d-MANNURONIC ACID LACTONE FROM THE MACROCYSTIS PYRIFERAWilliam L. Nelson and Leonard H. CretcherCite this: J. Am. Chem. Soc. 1930, 52, 5, 2130–2132Publication Date (Print):May 1, 1930Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNORMAL VALEROLACTONE. II. ITS VAPOR PRESSUREH. A. Schuette and Ralph W. ThomasCite this: J. Am. Chem. Soc. 1930, 52, 5, 2028–2030Publication Date (Print):May 1, 1930Publication History Published online1 May 2002Published inissue 1 May 1930https://pubs.acs.org/doi/10.1021/ja0…
An account is given of a method of determining the current-voltage characteristics of discharge tubes under flashing conditions, a cathode ray oscillograph being used. Results are given for neon lamps of the commercial Osglim type. Current/time and voltage/time curves are derived from the oscillograph records. It is s…
Abstract The electron emission produced when solid conductors are bombarded with electrons of controlled speed has formed the subject of a great number of investigations. It is now generally recognized that this emission consists of three different parts: (1) Primary electrons, truly reflected without loss of energy;…