Christoph Schissler (ca. 1531-1608)
Quadrant, 1599
Florence, Istituto e Museo di Storia della Scienza, inv. 155, 156

Two horary quadrants are engraved on this instrument, one with curved lines for unequal hours, the other with straight hour lines. The alidade has viewers and is graduated. The quadrant is equipped with a wooden stand and its original leather box.