有三角突起的锤
Bushhammer \Bush"ham`mer\, n. A hammer with a head formed of a bundle of square bars, with pyramidal points, arranged in rows, or a solid head with a face cut into a number of rows of such points; -- used for dressing stone. Bushhammer \Bush"ham`mer\, v. t. To dress with bushhammer; as, to bushhammer a block of granite.