Abstract
American Journal of Science, August.—Rowland's new method for measuring electric absorption and losses of energy due to hysteresis and Foucault currents, and on the detection of short curcuits in coils, by L. M. Potts. Rowland's method, in which the condenser is placed in one arm of a Wheatstone bridge, together with the fixed coils of an electrodynamometer, while the movable coil is mounted in the cross connection, is practically useful. The electric absorption always acts as a resistance in series with a capacity. The resistance is independent of the current, but the temperature has a decided effect on both.—Some new Jurassic vertebrates, by W. C. Knight. The author describes two new species, called Plesiosaurus shirleyensis and Cimoliosaums laramiensis respectively. They are in the Collection of the University of Wyoming.—Carnotite and associated vanadiferous minerals in Western Colorado, by W. F. Hillebrand and F. Leslie Ransome. Carnotite is probably a mixture of minerals of which analysis fails to reveal the exact nature. Instead of being the pure uranyl-potassium vanadate, it is to a large extent made up of calcium and barium compounds. Near Placerville, Colorado, certain sandstones show a igreen colouring and cementing material which contains nearly 13 per cent. of V2O3. It is intended to work this sandstone for vanadium.—Restoration of Stylonurus Lacoanus, a giant arthropod from the Upper Devonian of the United States, by C. E. Beecher. The arthropod described takes equal rank with the Giant Spider Crab of Japan and the great “Seraphim” (Pterygotus anglicus). The animal has a length of nearly 5 feet, and with the legs extended it would measure about 8 feet.—Iodometric estimation of arsenic acid, by F. A. Gooch and Julia C. Morris.—Further notes on pre-glacial drainage in Michigan, by E. H. Mudge. The author discusses the present and former levels in the vicinity of the village of Saranac.
Article PDF
Rights and permissions
About this article
Cite this article
Scientific Serial . Nature 62, 432 (1900). https://doi.org/10.1038/062432a0
Issue Date:
DOI: https://doi.org/10.1038/062432a0