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This is a portable sundial made of ivory. The compass is missing but the needle of the sundial is well preserved. The Chinese characters at the front mean: "The altitude of the north pole in Seoul is 37° 39′ 15″. The 24 divisions of the year are indicated. We assume that it was made by Kang Kyeon in the autumn of 1873 because the name of the manufacturer and the year it was manufactured are shown in Chinese characters on the reverse side.
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