Temporary copings

1942. The temporary coping is commonly a board, or two or more boards joined, so as to form a breadth of eighteen inches or two feet. To these boards hinges are attached, which fit into irons on the front upper edge of the permanent coping of the wall; and thus, by means of a rod, or a cord and pulley, the board is either made to project over the front of the wall, or is laid flat on the top of the permanent coping.