Abstract
American Journal of Science, May.—On the properties of seasoned magnets of self-hardening steel, by B. O. Peirce. In searching for a material of which to make a set of standard measuring magnets which should be as permanent as possible and have small temperature and induction coefficients, the author tested a number of magnets made of some of the brands of “self-hardening” tool steel now in common use for lathe tools. He found that the temperature coefficient could be reduced almost indefinitely by cutting the rods long and thin.—Some lava flows of California, by F. L. Ransome. This paper deals with a strip of the middle, western slope of the Sierra Nevada. The volcanic eruptions began during the Miocene period and continued to the end of the Pliocene. The deposition of auriferous gravels both preceded and accompanied the deposition of volcanic material. The author distinguishes three separate flows of lava, which were eventually brought to an end by fresh andesitic eruptions. During Pleistocene time the present streams have dissected the Neocene lavas and tuffs, and have deeply cut into the Jurassic and older rocks.—Some new Jurassic vertebrates from Wyoming, by W. C. Knight. The University of Wyoming has in its collection of Jurassic vertebrates partial remains of four swimming saurians that in a general way resemble Plesiosaurs. The discovery of these remains is of considerable value to American Mesozoic geologists for correlating the American and European Jurassic. The largest of the four species surpasses in size the European Pliosaur, and it is described under a new genus, Megalneusaurus. The description given is founded upon a cervical, dorsal, and caudal vertebra; one fore-limb nearly complete; ribs, and the greater portion of the pectoral girdle. The genus represents the largest known animals of the order Sauropterygia.—On the estimation of manganese separated as the carbonate, by Martha Austin. The carbonate precipitated by means of alkaline carbonates is very uncertain. An improvement in the quantitative analysis may be effected by converting the carbonate first into oxide and then into sulphate by heating with a few drops of concentrated sulphuric acid.
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Scientific Serials. Nature 58, 117 (1898). https://doi.org/10.1038/058117a0
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DOI: https://doi.org/10.1038/058117a0