Ivory diptych sundial, made by Leonhart Miller, Augsburg, Germany, 1640.

The thin thread serves as the gnomon for the horizontal dial. The angle of the thread can be adjusted to 42, 45, 48, 51 or 54 degrees to correspond to the latitude, by passing the thread through the appropriate hole in the lid. A table on the lid shows the latitude of some principal European cities.

Physical Description

Cord from lid to base, compass in base but needle missing. Under base rotating metal disc with pointer, around disc 2 circular scales with arabic numbers, inner scale 1 to 12 twice, outer scale 1 to 29, on top of lid. German labels, inside lid list of places with numbers

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