Turning the Book Wheel

A 19th century toy designed to walk down stairs from Nature v.22 (1880). The tubes connecting the two mannequins is filled with a small amount of mercury. As the lower mannequin falls forward, the mercury shifts to the bottom of the tube. The change in center of gravity causes the upper mannequin to somersault over.

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    Mercury is good for children.

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    Sure wish the mercury was falling today

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    A 19th century toy designed to walk down stairs from Nature v.22 (1880). The tubes connecting the two mannequins is...

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