RULE 278. On jumbo gear in which there are two winch drums each serving one end of a continuous runner (apart from the topping and slew drums) that are mechanically and/or electrically independent of each other and have one continuous cargo runner and under circumstances where neither the winch driver nor the hatchtender can see both drums in their line of vision, a wire watcher must be employed to watch the winch drums to ensure they do not go out of sequence, i.e. one drum allowing more wire out than the other drum.