James Norman Hall, Faery Lands of the South Seas
“ When a glance through the water-glass shows that the fish you want are gathered beneath you, a pebble is attached to the line by means of a special hitch, which can be undone by a jerk. Now you lower the line over the side until the bait is in the required position; a sharp pull frees the sinker, and you are ready for the first client. The theory of the detachable sinker is that it enables one to fish at a distance from the boat without having the hook rest on the bottom, where it is apt to foul in the coral. ”
