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FunctionTime-finding by orienting the gnomon to point toward the North Pole with the aid of a magnetic compass and an angular adjustment for latitiude.
ProvenanceJoseph Drecker, Aachen, Germany, before 1928 (no. 75); Frederik Casparus Wieder, Noordwijk, The Netherlands, 1928; D. P. Wheatland, Topsfield, MA, 1959; gift to CHSI, ca. 1987.