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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|
|Credit line: National Maritime Museum, London|