摘要:

AbstractA review of the literature is cited. Dielectric and physical properties are listed for fifteen oxides which are included in the glass phase of a steatite body. Data from electrical measurements made at 500, 600, 1000, and 1100‐kc. frequencies and at 25°, 85°. 120°, and 150°C. are included. The results of petrographic examination are noted for each body. A systematic classification in terms of the periodic table indicates correlative characteristics with respect to valency and atomic w

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb09118.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractA study was made of the amount of glassy bond present in a typical whiteware body after various heat‐treatments. Petrographic methods, with polished sections and powder mounts, were used for these determinations.The results obtained by both methods and by independent observers agreed very well. With the higher firing temperatures, the amount of glass increased and the number of crystals decreased. Pore space diminished as the temperature was raised to the maturing temperature; above that point the pore volume increase

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb09119.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractThe rate of homogenizing of soda‐lime‐silica glass under conditions of minimum convection mixing and in the absence of refractory materials was measured by the centrifuge density spread technique developed by Turnbull and Ghering. Measurements on melts prepared in pure platinum containers at 2550°F. showed that the density spread decreases rapidly during the first 16 hours of melting following which further decrease occurs at a much slower rate. The portion of glass responsible for the major part of the density spread was a light fraction, which tended to form or accumulate at the surface of the

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb09120.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractThe solubility of iron oxide in ground‐coat enamel glasses at various temperatures was studied by adding varying amounts of ferric oxide to the milled enamel and giving the mixture a heat‐treatment to acquire uniformity without devitrification at the desired temperature. The iron oxide solubility was obtained by finding the breaking point in the curve for iron oxide versus index of refraction. The frit solubilities were obtained at 1400°, 1600°, 1800°, and 2000°F. with variations in Na2O, B2O3, A12O3, CaF2, CaO, F2, SiO2, COO, NiO, MnO2, BaO, and MoO3. Data are given on a number of commercia

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb09121.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractExpanded Vermiculite has been studied for use with a low vitrifying plastic clay bond to form structural clayware, such as partition tile and bathroom tile, which may carry glazed coatings in decorative effects. The advantages of this material are its low thermal conductivity, its relatively high strength as compared to its specific gravity, and the ease with which it can be cut and fitted into installations.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb09122.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractThe actual change caused by storing neutral grain spirits, gins, and various whiskies in glass bottles supplied by nine manufacturers and in Pyrex‐brand glass at room temperature for three years was determined. The effect of commercial glass on the hydrogen‐ion concentration of neutral grain spirits is greater than on gins, blended whiskies, and whisky, respectively. The hydrogen‐ion concentration of these products continues to increase proportionately with the time they are stored in the commercial glass bottles. Neutral grain spirits and gin that were stored in Pyrex‐brand glass remained constant for one year and increased slightly in hydrogen‐ion concentration during the time studied. The hydrogen‐ion concentration of blended whiskies and whisky remained constant when they were stored in Pyrex‐brand glass. Neutral grain spirits and gins that were stored in commercial glass bottles showed dissolved silica, magnesium, and aluminum under spectro

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb09123.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractDuring the long‐time aging of thermometers at constant temperature, the change in readings of a fixed point, such as the ice point, normally follows an exponential law,y= a(1 –e‐mt). Methods are described for the evaluation of the total expected change,a, of the relaxation time,l/m, and of the half‐life period,H= 0.693/m. Examples are given and calculations are made of the expected change remaining after any aging time,t. It is believed that the exponential law is due primarily to bulb shrinkage under the influence of a single molecular mechanism in the glass. Some examples are presented of anomalous behavior, such as reversals in the direction of change. This phenomenon is shown to be a general one in glass, and an interpretation is given in terms of several molecular processes which operate at one time but with different characteristic rates. An expression is derived for the calculation of change of density in glass, based on experiments in which the glass is in the form of a thermometer. The methods of mathematical analysis described in this paper are useful for evaluating the effects of accelerated aging treatments o

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb09124.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractVarious metals in small quantities, singly and in various combinations, were ground in lead and leadless glazes. It was found that various colored lusters, transparent and opaque, could be reproduced under a fair degree of control in an ordinary downdraft gas‐fired sagger kiln, which was fired from cones 010 to 1. After cooling to a dull red heat, the glazes were given a short reduction firing. Standard decorative processes were used with the luster glazes. Additional colors were produced by adding stains and metal oxides. Acid‐resistant luster glazes were develo

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb09125.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY