“ Shrapnel is designed for use against troops in open country or for clearing covered spaces, destructive effect over a considerable area rather than penetrative power being desired. With this in view the fuze is so adjusted that the projectile bursts in close vicinity to the target and scatters its fragments and the balls, which may be placed either in metal or wooden frames or plates or in a matrix of resin. In naval warfare shrapnel is used against attack by torpedo boats or small boats. See Projectiles, where United States Army 3.2-inch shrapnel is illustrated ”