1st, quantity water: Left side (1) turns on switch above the barrel to meet the full water right side, then leads to the bucket water valve switch (altogether three) all to open, then hits the mark between the four square shapes switch left side, the current of water to in the right side barrel, then opens in the barrel switch to meet again the full water right side, then turns on the square switch to flow to the barrel, by now because right side in the barrel water has surpassed the spacing right side, the volunteer fire brigade automatic escape, had first to close under the barrel switch by now, prevents when met the flood water the volunteer fire brigade to run away. (2) left side in present barrel surplus small water diversion, flows in again this water diversion to in the right side barrel left side, then turns on in the barrel switch again right side, again turns on the square switch to flow in the barrel, if succeeds, the volunteer fire brigade drop arrives in on bowl, the bird can come to drink water. 2nd, 华容 said that, makes concrete does according to the under chart: