National Museum of American History
Vopel Compendium
Vopel, Caspar · ca 1540
This is a complex brass instrument, consisting of a nocturnal, a sundial, a lunar aspectarium, and a geometrical quadrant. The maker, Caspar Vopel (1511-1561), taught mathematics in Cologne and studied cosmography. He made a number of armillary spheres and globes.
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