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Declination 
his is the actual compass, with a paper dial (note the tear across the dial), carried by William Clark on the Expedition. The compass is in a hinged box that can be closed to protect the compass face and is small enough to be carried in a large pocket. The compass ring showing degrees on the outside of the dial can be rotated to adjust the instrument for declination.From Discovering Lewis & Clark®, http://www.lewis-clark.org © 1998-2008 VIAs Inc.
Journal excerpts are from The Journals of the Lewis and Clark Expedition, edited by Gary E. Moulton
13 vols. (Lincoln: University of Nebraska Press, 1983–2001)