Gunner's Calipers, Old State House, Boston, Massachusetts. Also known as a "gunner's quadrant," this versatile tool could be used to measure the size of a cannonball, to measure the size of a gun barrel, as a ruler, and also a protractor. This set was made by Paul Revere and used during the Revolutionary War.Galleries:Massachusetts, Metal CraftKeywords:american revolution, boston, bostonian society, colonial america, colonies, freedom trail, gunner caliper, gunner quadrant, history, massachusetts, old state house, paul reverePhoto Location: Boston, MassachusettsPhotographer: Dr. Roy WinkelmanDate of Photo: 05/28/2011Device Make: CanonDevice Model: Canon EOS 5D Mark IIOriginal Dimensions: 4994×3744Picture Orientation: LandscapeGPS Coordinates: 42º21'31.55"N 71º03'26.69"WPicture Number: 10829
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