BLOCKS (Encycl. Plate XCV. fig. 5.) a, Represents a single block, and b, c, two double ones of different kinds, without stops; e, f, two double tackle blocks, iron bound, the lower one, f, being fitted with a swivel; g, a double iron block with a large hook; h, a small block; i, a top block; k, a voyal block; l, a claw garnet block; m, the cat block, employed to draw the anchor up to the cat-head. See Cat-Head, Encycl.