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Reflecting circle - Borda type, c. 1790.

Reflecting circle - Borda type, c. 1790.
Reflecting circle - Borda type, c. 1790.
© National Maritime Museum, London
Repro ID: D6555
Description: A reflecting circle was used to measure the distance between the moon and certain stars in the 'lunar distance' method of finding longtitude. Trade directories show that the firm of Spencer Browning and Rust was located at Wapping between 1784 and 1839.
Creator: Spencer Browning and Rust
Date: c.1790
Credit line: National Maritime Museum, London
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National Maritime Museum/Royal Observatory GreenwichNew Opportunities Fund 
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