Double-thread sundial

Museo della Civiltà Contadina del Friuli Imperiale (Sundials courtyard)    

Photo n° 3

The meeting point of the shadows projected by the two threads on the quadrant is the way by which this modern sundial indicates the time. The hours on the quadrant indicate the solar time on the line of the winter solstice (December 22^nd), and the summer time on the line of the summer solstice (June 21^st).