Gunner's Rule
Physical Object
1986.008.0619
Nuestra Señora de Atocha (1622)
circa 1620
A bronze gunner’s rule was used to measure the bore diameter of a cannon. The blade-like device had numerical scales engraved into both faces (now corroded and illegible) that indicated the appropriate size and weight of shot for the diameter. The multiple scales had calculations for iron, lead, or stone shot. It has an ornate handle that might have had a now-unknown function.