Geography: two rotating discs showing the hemispheres of the earth, fixed to a card giving details of their use. Engraving by J. Emslie, 1844, after himself.
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Geography: two rotating discs showing the hemispheres of the earth, fixed to a card giving details of their use. Engraving by J. Emslie, 1844, after himself. Credit: Wellcome Collection. Public Domain Mark