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: