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backstaffBACK'STAFF, n. [back and staff, so called from its being used with the observer's back toward the sun.] A quadrant; an instrument for taking the sun's altitude at sea; called also, from its inventor, Davis's quadrant. |
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backstaffBACK'STAFF, n. [back and staff, so called from its being used with the observer's back toward the sun.] A quadrant; an instrument for taking the sun's altitude at sea; called also, from its inventor, Davis's quadrant. |