"Chemical analysis" Quotes from Famous Books
 ... principal facts with reference to the aerolites, upon which general dependence may be placed. Immediately after their descent they are always intensely hot. They are covered with a fused black incrustation, consisting chiefly of oxide of iron; and, what is most remarkable, their chemical analysis develops the same substances in nearly the same proportions, though one may have reached the earth in India and another in England. Their specific gravities are about the same; considering 1000 as the proportionate number for the specific gravity of water, that of some of the aerolites has been ...
— Harper's New Monthly Magazine, Volume 1, No. 4, September, 1850 • Various
... thousands of years before our era (fig. 224). The craftsman, seated before the furnace, takes up a small quantity of the fused substance upon the end of his cane and blows it circumspectly, taking care to keep it in contact with the flame, so that it may not harden during the operation. Chemical analysis shows the constituent parts of Egyptian glass to have been nearly identical with our own; but it contains, besides silex, lime, alumina, and soda, a relatively large proportion of extraneous substances, as copper, oxide of iron, and oxide of manganese, which they apparently knew ...
— Manual Of Egyptian Archaeology And Guide To The Study Of Antiquities In Egypt • Gaston Camille Charles Maspero
... the soil contains within itself some available plant food. We can determine by chemical analysis the exact amounts of the various plant foods—nitrogen, phosphoric acid, potash, etc.—which a crop of any vegetable will remove from the soil. The idea in scientific chemical manuring is to add to the available plant foods already in the soil just enough more to make the ...
— Home Vegetable Gardening • F. F. Rockwell
... pigment consisting of zinc sulphide and barium sulphate, sometimes exhibits the peculiar property of darkening on exposure to sunlight. This property is due to an impurity and apparently cannot be predicted by chemical analysis. During the cloudy days and winter months when powerful sunlight is unavailable, the manufacturer is in doubt as to the quality of his product and he needs an artificial light-source for testing it. In such a case the white flame-arc is serving satisfactorily, ...
— Artificial Light - Its Influence upon Civilization • M. Luckiesh
... the edge of the Ozark Mountains in central Arkansas issue springs of hot water which are effective in the alleviation of rheumatic and kindred ills. Although chemical analysis fails to explain the reason, the practice of many years has abundantly proved their worth. Before the coming of the white man they were known to the Indians, who are said to have proclaimed them neutral territory ...
— The Book of the National Parks • Robert Sterling Yard
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