Ioannis de Sacrobusto Libellus de sphaera : accessit eiusdem autoris computus ecclesiasticus, et alia quaedam in studiosorum gratiam edita / cum praefatione Philippi Melanthonis. Image 5.
Interactive illustration of a round instrument intended to diagram the roundness of the Earth. The paper instrument is illustrated with two figures and foliage towards the bottom.
Utah State University, Merrill-Cazier Library, Special Collections & Archives, Rare (COLL V BOOK 489a)
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