dip circle
Britishnoun
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012Example Sentences
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Relics found about Ross Cairn, on Point Victory, May and June, 1859, brought away:— A 6-inch dip circle by Robinson, marked I 22.
From Project Gutenberg
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.
From Project Gutenberg
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