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Wikimedia Commons · Public domain · Hover to magnify, click for fullscreen
Original fileDiptych sundial in the form of a lute, circa 1612. The gnomons-style is a string stretched between a horizontal and vertical face. This sundial also has a small nodus (a bead on the string) that tells time on the hyperbolic pelikinon, just above the date on the vertical face. C:\Sundial in the form of a mandolin - Project Gutenberg eText 15050.png
Object
Digital Source
Wikimedia Commons · Public domain
1200 × 948 px