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. JohnsKeywords:Fort Matanzas National Park, Forts, National Monument, Saint Augustine, Spanish fort, St. Augustine, antique, cannon, quadrantPhoto Location: Fort Matanzas National Monument, St. Johns County, FloridaPhotographer: Dr. Roy WinkelmanDate of Photo: 12/17/2013Device Make: CanonDevice Model: Canon EOS 5D Mark IIExposure Time: 0.25F Number: 18Original Dimensions: 3744×5616Picture Orientation: PortraitGPS Coordinates: 29°42′55″N 81°14′21″WPicture Number: 26685
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