EditorialPortrait of Nicolaus Petri Title page for: N. Petri. Practicqve, to learn to count, cypheer and keep a record, 1605, Portrait of Nicolaus Petri [van Deventer], calculator and astronomer in Amsterdam. Half-length portrait, behind a table with mathematic...
EditorialTwenty-sided die (icosahedron) with faces inscribed with Greek letters, Ptolemaic Period?Roman Period, 2nd century B.C.?4th century A.D., From Egypt, Faience, Height: 4.5 x L: 4.9 x W: 4.7 cm (1 3/4 x 1 15/16 x 1 7/8 in.), A number of polyhedral dice m...