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单词 dip circle
例句 dip circle
Relics found about Ross Cairn, on Point Victory, May and June, 1859, brought away:— A 6-inch dip circle by Robinson, marked I 22. In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions 2011-10-10T02:00:18.377Z
It may be well to repeat that the Magnetic Pole is that point where the needle of the dip circle is absolutely vertical—where it stands at exactly 90� to the plane of the horizon. McClure's Magazine, Vol. 1, No. 2, July, 1893
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