. An account of the Arctic regions [microform] : with a history and description of the northern whale-fishery. Natural history; Sciences naturelles. rr^ 194 ACCOUNT OF THE ARCTIC REGIONS. )d':,.i. and its attached pieces, were under water, by the Avay of distinguishing the degree of impregnation produced by pressure, from the absorption which takes place from simple immersion. On being l)rought up, they were all specifically heavier than sea-water; and, when compared with the counter- parts, the clear effect of impregnation by pressure, was found to be 302 grains in the fir and hickory, and 31
. An account of the Arctic regions [microform] : with a history and description of the northern whale-fishery. Natural history; Sciences naturelles. rr^ 194 ACCOUNT OF THE ARCTIC REGIONS. )d':,.i. and its attached pieces, were under water, by the Avay of distinguishing the degree of impregnation produced by pressure, from the absorption which takes place from simple immersion. On being l)rought up, they were all specifically heavier than sea-water; and, when compared with the counter- parts, the clear effect of impregnation by pressure, was found to be 302 grains in the fir and hickory, and 316 grains in the ash. This experiment was repeated in latitude 78° 2', on the 7th June 1817, by the immersion of several articles of different shapes '^ and sizes, to the depth of 4566 feet. On this occasion, the apparatus was 30 minutes on its way down, rested 40 minutes, and took 36 minutes in drawing up, being altogether 106 minutes under water. The degree of impregnation produced on each of the different substances usvi in this ejqie- riment, is stated in the annexed Table. * My friend Professor Leslie suggested this variation of trying the relative degree of impregnation, on pieces oi' the same kind of wood, of different shapes;âa hint which I pro- fited by in my later experimentSr 4 -â â (U-; »». -T'l. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Scoresby, William, 1789-1857. Edinburgh; [London] : Printed for Archibald Constable and Co. , Edinburgh; and Hurst, Robinson and Co. .. London
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectsciencesn
