| 摘要 |
Superimposed light-transmitting walls 10-13 define intervening chambers 1 4- 16 containing differently coloured liquids, and discreet volumes of gas are introduced into a bottom region of each chamber such that rising volumes of gas present moving differently coloured areas to an observer looking through the walls. The display area is increased by forming liquid reservoirs 20-22 at the top of each chamber, with anti-spill valves 30-32 which admit or release air when a preset pressure differential is exceeded. A positive displacement pump recirculates gas from the reservoirs to respective inlets 34-36 at the bottom of the chambers. Gas flow separators are provided adjacent to the inlets, and the chambers have side spacers with inward projections to prevent volumes of gas from tracking up the sides of the chamber.
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