Circle sextant, Borda circle, reflecting circle, circumferator, repeating circle, this instrument is known among several names. In Paris Chevalier de Borda published a description of his instrument in 1787. The instrument can measure angles greater than 180 degrees. At sea, it is used in determining lunar distances. This well preserved instrument is made by Schwartz, Lenoir’s successor. Etienne Lenoir (1744 – 1832) who had his workshop also in Paris. In his time Lenoir was considered as the best designer of nautical
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