Safety Device 2 : A mechanical device incorporating a line and belt. The belt must be attached to the head of the ladder or to the drill tower and to the belt, which must be worn by the man being carried down or lowered during drills
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}