A short dictionary entry from Knight's American Mechanical Dictionary defining the rope-making 'top', a grooved wooden plug used to regulate the twist when three strands are laid up into a rope. It describes how each strand sits in a groove, how the top is held by a pin and tails, and how it moves between the breast-board and sledge hooks. A line drawing (Fig. 6548) shows the top with the strands and with a twisted rope.