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Unusual piece
The nautical astrolabe is simplified to measure the altitude of the stars for purposes of navigation
Miniature sundial
But in 1838 Sir Charles Wheatstone addressed the Royal Society in London to present several pairs of line drawings with geometrical form which when viewed by an instrument very similar to this gave the impression of three dimensions
Miniature Astrolabe Key Ring Scientific Unusual pieceMiniature of classic European astrolabe. Set for 41 lat. Scale significantly reduced (very complex instrument in this size could be used to learned its parts and basis of use. A real expert could play more). Astrolabes date from the time of Ptolemy and the name in Greek means "Star Searcher." It is a tool for astronomers, astrologers, and surveyors widely used until the 17th century. This beautifully crafted instrument of brass with brass key ring