Speculum solis, das ist: Sonnen-Spiegel, oder kunstständiger ... Bericht von den Sonnen Uhren ... vormals ... in zweyen Theilen beschrieben, nunmehr aber mit dem dritten Theil, allerhand neuer Erfindungen vermehret ...
Speculum solis is a 1660 German treatise on sundials by Franz Ritter, printed in Nuremberg by C. Gerhard for P. Fürst and aimed at instrument makers and scholars. The pictures are dense black-letter text pages with decorative woodcut borders, a printed preface, and a tabular layout of hour lines, offering a designer examples of early modern German typography, ornamental frames, and columnar table setting.
