Signedon compass card: G. KING / Maker. / No. 8, North Row, / BOSTON.
on compass card: Callender Sp
FunctionMarine compasses determined the sun's azimuth in order to correct for magnetic declination of the compass. They were used for steering the ship on course.
Historical AttributesGedney was working in Boston by 1800 and added his son, Charles Gedney King, to his business in 1832. Joseph Callender was a pupil of Paul Revere and a die sinker at the Massachusetts mint.