A cannon is a type of artillery, usually large and tubular in shape, that uses gunpowder to propel a projectile over a distance. Cannons vary in size, range, mobility, rate of fire, and fire power; different types of cannon combine these attributes in varying degrees to carry out their intended purpose. The demonstration is spectacularly noisy, producing sharp, crackling bursts of noise and flame which sometimes seem to build rhythmically. A trial run is recommended for those trying it for the