GLASS-MAKING MATERIALS. - USGS

GLASS-MAKING the last season several important glass -manufacturing districts Tiave been visited (by Survey geologists, and careful investigation lias been made of the glass sands and other .raw materials used in the manufacture of this produc i. The results of this work are sum- marized in the following three reports:THE REQUIREMENTS OF SAND AND LIMESTONE FOR EKNEST F. data for the following paper were derived from a brief study of the glass saids of the middle Mississippi basin. glass manufacture admits of such slight variations in the character of its raw materials that the materials used from the Central States are rgarded as representing very fairly the grade demanded for the industry at large. Thr points considered in this paper are intended mainly to serve as a guide to persons who wish to know whether certain sandstones or limestones may be suitable for glass making There- fore only the chemical and physical p:operties are taken up here, and the consideration of other conditions on which the value of a deposit depends is reserved for the paper " glass sands of the middle Mississippi basin," pages 459-472 of this *~ ' * ^The sfatfyffUs&if the production of glass sand in 1902, 1903, and 1904 have been gathered and coixmJsMpA.)

Glass is a fused mixture of the silicates of alkalies, alkaline earths, and of more common ... the, mass of the original mixture, or from 60 to 75 per cent of the finished product after melting has driven o(F carbon dioxide, sulphur dioxide, and othec volatile materials. To the sand is due the absence of color (according to its purity), the ...

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