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Title: Reflecting circle made by Henry-Prudence Gambey, Paris, circa 1820-1855 Accession Number: 1963.362 Category: INSTRUMENTS - CIRCLES Type: reflecting circle Maker: Gambey, Henry-Prudence Place: FRANCE, Paris Date: circa 1820-1855 Materials: Description: Brass repeating circle (full circle of reflection), in case, ca. 1820-55; brass frame, wood handle, crystal chipped; inscribed on arc "Gambey a Paris (No. 214)." (Henry-Prudence Gambey); repeating full circles were devised to eliminate the slight degree scale error by averaging out error of arc and parallel light ray problems of reflecting octants and sextants; not widely used because of high relative cost. |
 Mystic Seaport Image ID m166594 Information regarding reproductions |