Revision history of "File:Backstaff.jpg"

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  • (cur | prev) 20:30, 25 March 2011‎ Sean (talk | contribs)‎ . . (443 bytes) (+443)‎ . . ("The back-staff, also known as the Davis quadrant (called a quadrant because it could measure up to 90º), was the first instrument specifically designed for finding latitude at sea. English explorer John Davis conceived the instrument while on a voyage t)
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