The most fusible spoduniene-feldspar mixture used in these studies was composed of 30yo of spodumene, 10% of potash feldspar, and 60% of soda feldspar. In semivitreous bodies and vitreous hotel chinaware bodies, however, the most effective fluxes were made up of 30 to 40% of spodumene, 40 to 00% of potash feldspar, and 10 to 20y0 of soda feldspar. Such fluxes lowered the maturing temperature of these bodies and improved their strength at lower temperatures. When they were fired a t cones f i to 0, thcir rrsistancc t o impact was equal to or higher than that of the feldspar bodies.
These changes, which are brought about by variations in specific gravity and additions of electrolytes in the enamels studied, represent a wider range in set conditions than normally encountered in a laboratory or plant production work.Only those data pertaining to a typical commercial zirconia-opacified sheet-steel cover enamel have been presented since they embrace such a large span of consistencies. However, some exploratory studies have been made on other enamels such as a sheetsteel ground coat and a titania-opacified cover coat with highly satisfactory results. Sufficient data were obtained t o indicate the viscosimeter's successful application to these enamels.If handled with reasonable care and observing certain precautions, the Brookfield Svnchro-Lectric, or similar instrument, should afford the following advantages in measuring or controlling enamel slip consistency :(I) Rapid determinations.(2) Results translatable into absolute viscosity units.(3) Wide ranges.(4) (5) Portability.High accuracy and good reproducibility.
CHICAGO VITREOUS ENAMEL PRODUCT COMPANY RESEARCH LABORATORIES
CICBRO, ILLINOISABSTRACT Optical glasses with high indices of refraction and Abbe values are very desirable for wide angle lenses. In order to determine the range of compositions in which glasses of this type could be produced, oxides of lithium, beryllium, calcium, boron, lanthanum, or thorium were substituted for barium oxide or silica in a three-or-four component base lass. Substitutions were made on a mole-for-mole basis. The indices of refraction for glasses with indices of refraction ( n~) and Abbe values from 1.600 to 1.714 and 62.2 to 52.7, respectively, were made in small platinum crucibles.'i, t e C, D, F, and G' lines and the liquidus were determined for each glass. Experimental
Optical glasses with high ind ices of refraction and Abbe values are very desirable for wide-angle lenses. In ord er to determin e the range of composit ion s in which glasses of th is type eou ld be prod uced, oxides of Li , Be, Ca, B, La, or Th , were substit uted for BaO or Si02 in a th ree-0 1' fou r-compon e nt base gla ss . Su bstit ut ion s we re made on a mole-for-mole basis. The indices of refraction fol' tlle C, D, F , a nd G' lin es and t he liquidus we re determ ined for each g la s. Experimental glasses wit h indices of refra ct ion (n D) and Abbe values fl' om l.600 to l.71 4 and 62.2 to 52.7, respectively, " 'ere made in mall platinum cru cib les.
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