Word: silica
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Dates: during 1940-1949
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Within the box raged a miniature storm of aluminum powder, churned by compressed air. With each breath the miners inhaled about five million tiny aluminum particles. The doctors' theory: aluminum powder forms a coating around silica powder in the air sacs, prevents formation of lung-eating silicic acid...
...influence of these placarded, shuffling men spread through the arteries of commerce. Cars lay idle along the coal and ore railroads-the Pennsy, the Bessemer & Lake Erie, the C. & O. Work would soon slacken in limestone quarries, zinc smelters, silica diggings. Barge traffic thinned as the tires were banked along the Monongahela, the Allegheny, the Ohio Rivers. Snow lay undisturbed on the great, vermilion open pits of the Mesabi Range...
...steelmaking, varied grades of ore are used. Steep Rock's high-grade ore (it has a low silica and high iron content) is ideal for mixing with lower-grade U.S. ores. It would be impractical to use Steep Rock ore exclusively in steelmaking. Consequently Canada will ship much of Steep Rock's production to the U.S. and continue to import lower-grade U.S. ores...
Powers' chemicals have no effect on the appearance of the materials treated. To prevent runs in stockings, he devised a treatment with a colloidal chemical called silica sol. Very fine grains of silica (in visible to the naked eye), deposited on the threads, make snagged threads cling to their neighbors instead of unraveling. The same chemical is used to put a lusterless coating (which must be renewed from time to time) on blue serge and to impregnate wool so that it achieves a durable crease when pressed under heat. To make wool shrink-proof, Powers first wets...
...after five years of research, J. J. Denny, Drs. Wilmot Douglas Robson and Dudley Arthur Irwin, working for Ontario's Mclntyre-Porcupine (gold) Mines, found a strange treatment which worked on guinea pigs: fine aluminum dust. When inhaled, aluminum dust forms a jelly around the silica particles, making them harmless...