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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.© 2009 by The Lewis and Clark Fort Mandan Foundation, Washburn, North Dakota.
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)