World-life; or, Comparative geology . ia Observatory, re-ported a dust-fall with much metallic iron in Sicily, March 29-30, 1883 {Atti deiJi. Acadtmia dei Lincei, fasc. 6, May, 1880: Nature, xxi, 574, xxii, 257). OnSicilian dust-falls, which have been particularly frequent, see Lancetta in hisSynthesis of meteorological observations in Modica and Syracuse, on the fall ofmeteoric powders from the end of 187(5 to April 16, 1880 {Rerista Sclenlijica-ludustiiale. No. 15, August 1880). M. Daubree reports further dust-falls atAutun, April 15, 1880, and in the Departments of the Basses-Alpes, Isere a
World-life; or, Comparative geology . ia Observatory, re-ported a dust-fall with much metallic iron in Sicily, March 29-30, 1883 {Atti deiJi. Acadtmia dei Lincei, fasc. 6, May, 1880: Nature, xxi, 574, xxii, 257). OnSicilian dust-falls, which have been particularly frequent, see Lancetta in hisSynthesis of meteorological observations in Modica and Syracuse, on the fall ofmeteoric powders from the end of 187(5 to April 16, 1880 {Rerista Sclenlijica-ludustiiale. No. 15, August 1880). M. Daubree reports further dust-falls atAutun, April 15, 1880, and in the Departments of the Basses-Alpes, Isere andAin, France, April 21-25, 1880 {Comptes Eeiidm, 10 Maj% 1880), as also in Algiers,April 24-2f;, 188) {Nature, xxii, 7(j). Mr. Murray of the Challenger foundmeteoric dust in the dredgings from the bottom of the sea. (See Archi-bald Geibie: Geol ,gical Sketches, ch. vi, Huniboldt Library, No. 39, p. 35.) Pro-fessor D. Kirkwood has reported a dnst-fall in Indiana, March 28, 1880 {Popu-lar Science Monthly, xvii, 553). 12 COSMICAL METEORS. 13 An insignificant addition to the earths mass, the readermay think. But let us examine. Ehrenberg states that themass of dust which fell at Lyons in 1846, over an extent of400 square miles, was estimated by the French savans tobe 7,200 quintals, or 793 tons. Chladni calculated thatthe aerolites enumerated by him as falling between 1790and 1818 weighed 600 quintals, and on this basis it hasbeen held that the daily fall of atmospheric dust must bemillions of quintals. Ehrenberg calculated that 243 quin-tals, or 27 tons, of red dust fell with snow over 100 squaremiles in the mountains about Salzbourg, on the 6th ofFebruary, 1862. According to M. Calvert, 15 French tonsper square mile fell in Carniola on the 5th of April, Nordenskjold says : I estimate the quantity ofthe dust that was found on the ice north of Spitzber-gen, at to 1 milligram per square metre, and probablythe whole fall of dust for the year exceeded the latter
Size: 1252px × 1996px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisherchica, bookyear1883
