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This can be bulb thermometer. When the bulb is held in the hand the liquid warms, expands, and rises up the tube. It can also be a novelty such as the "drinking bird". When the bulb on the bottom is held in the hand, the liquid expands and rises up the tube to the head making it heavier so the bird tilts down.

It's possibly a variation of a lava lamp. The fluid in the lava lamp was heated by the bulb on bottom and rose to the top where it cooled and fell again. There may have been a hand held variation that worked on the heat of your hand.

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7y ago

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