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Set for 50
Diameter: 2
Made of brass and printed markings
The Tidal Abacus
The original can be found in the British Museum
Altitude Ring Dial - Miniature - Hanging Praxinoscope Set for 50Miniature sundial. Height sundial. From 16th 17th centuries. This dial is a solar altitude clock. It takes ts name because the parameter of its construction is based on the altitude of the Sun. The dial is composed of a circular band perforated by two offsetting symmetrical holes through which the sun rays pass and are projected as a small elongated spot of light on the hourly line etched on the interior of the dial. Crafted of brass comes complete
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