Prince Rupert's Cube/Historical Note

Historical Note on Prince Rupert's Cube
According to, the puzzle now known as Prince Rupert's Cube was first posed by in $1693$.

The correct answer was determined by.

An incorrect solution to this puzzle, often quoted in the literature, was provided by himself, who assumed that the tunnel in question would be parallel to the space diagonal of the cube.

This provides a solution of $\sqrt 6 - \sqrt 2 \approx 1 \cdotp 03527$.