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Diorama egg dunk tank — image 1

Diorama egg dunk tank

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A mechanically simple dunk tank frame scaled for use with a regular egg. Needs water bottle liner to function.

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Creative Commons — Attribution — Noncommercial

My daughter was doing a history project on the medieval European witch trials, where one method of detection was plunging the accused into water. Merging carnival amusements with time-tested science projects of yesteryear, we designed and printed this dunk tank, specifically sized for use with a regular sized chicken egg (which she painted).

The tank itself obviously won't hold water, since it's got a giant hole in it (meant to be the viewing window). The main shaft was designed to fit a Bai Wonder Water bottle (with the cap and top roundover cut away) - this alleviated the need to consider waterproofing or adequate strength for hoop stress.

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