"[Lot of 3 Horololgical diagrams]", Ritter, Franz
Subject: Cartographic Miscellany
Period: 1610 (dated)
Publication: Speculum Solis…
Color: Hand Color
13.2 x 11.3 inches
33.5 x 28.7 cm
Franz Ritter was a German mathematician and astronomer whose works are extremely rare. These beautiful engravings are horological diagram remarkable for the elaborately engraved decorative border. At top is a large cartouche and at bottom is a 32-point wind rose. Each showing a different mathematical calculation.