. Narrative of a journey to the shores of the Polar Sea, in the years 1819, 20, 21, and 22 [microform]. Scientific expeditions; Expéditions scientifiques. ^jmBiMmitiMlii>'Sit^!i»tMUMM^ili&iitoM.''' f: No. IV.] REMARKS ON TABLE, No. VII. 635 taining any observations for variation in crossing the Barren Grounds, when the expedition, on its return from the sea-coast, was passing over the same parallels of latitude, and much to the eastward of the Copper-Mine River, because azimuths obtained on that journey would have materially assisted in forming an estimate respecting these curves. I app
. Narrative of a journey to the shores of the Polar Sea, in the years 1819, 20, 21, and 22 [microform]. Scientific expeditions; Expéditions scientifiques. ^jmBiMmitiMlii>'Sit^!i»tMUMM^ili&iitoM.''' f: No. IV.] REMARKS ON TABLE, No. VII. 635 taining any observations for variation in crossing the Barren Grounds, when the expedition, on its return from the sea-coast, was passing over the same parallels of latitude, and much to the eastward of the Copper-Mine River, because azimuths obtained on that journey would have materially assisted in forming an estimate respecting these curves. I apprehend much of the irregularity in the results of the observations for the variation along the Copper-Mine River is to be attributed to local causes of attraction, and particularly to the existence of iron ore among the rocks, which is very general. As we proceeded along the sea-coast tc the eastward from the mouth of the Copper-Mine River to Bathurst's Inlet, the easterly variation decreased considerably, though there was not a material change in the latitude ; but, in advancing to the north and westward from Bathurst's Inlet to Point Turnagain, the easterly variation increased again. A greater intermixture of iron ore was perceived in the rocks on the sea-coast, than on the banks of the Copper-Mine River. It should be observed that when we were at the first cascade in Hood's River on July 31st, we perceived the needles to traverse so sluggishly that it became neces- sary to retouch them with the magnets. The remarks on the dip of the magnetic needle will accompany the Table which contains those m:. 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 Franklin, John, Sir, 1786-1847. London : J. Murray
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Keywords: ., bookcentury1800, booksubjectscientificexpeditions, bookyear1823
