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Astronomical Compendium
Signed by Tobias Volckmer
Dated 1588; Brunswick
Gilt brass and silver; 74 x 74 x 27 mm

This instrument contains a thread reel, engraved with a zodiac and calendar scale, to which is wound a measure consisting of four different coloured threads joined together consecutively.

A protractor moves along the thread.

The inside of one of the leaves has a dial with sprung gnomon. The hour lines are designed for the southern hemisphere and for a horizontal dial, but on the sides of the main box are two simple catches to keep it vertical.

British Museum, London
Registration no. MLA 1886, 4-19.1

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Basic URL: http://www.mhs.ox.ac.uk/epact/catalogue.php?ENumber=33244

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