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Artillery Trajectory Quadrant

Artillery Trajectory Quadrant

This gunner's "quadrant" was used to measure the angle of the cannon barrel, in order to predict the trajectory (which was a critical part of aiming the gun) of the fired shot. The fort is listed on the National Register of Historic Places, as Fort Matanzas National Monument.
Galleries: Cannon, Fort Matanzas, Forts and Fortifications, St. Johns
Keywords: Fort Matanzas National Park, Forts, National Monument, Saint Augustine, Spanish fort, St. Augustine, antique, cannon, quadrant
Photo Location: Fort Matanzas National Monument, St. Johns County, Florida
Photographer: Dr. Roy Winkelman
Date of Photo: 12/17/2013
Device Make: Canon
Device Model: Canon EOS 5D Mark II
Exposure Time: 0.25
F Number: 18
Original Dimensions: 3744×5616
Picture Orientation: Portrait
GPS Coordinates: 29°42′55″N 81°14′21″W
Picture Number: 26685