Abstract
In a communication to the Royal Society of Edinburgh of 4th March 1889, I stated the problem of constructing a jointed model under gyrostatic domination, to fulfil the condition of having no rigidity against irrotational deformations, and of resisting rotation, or rotational deformation, with quasi-elastic forcive in simple proportion to rotation. I gave a solution, illustrated by a model, for the case of points all in one plane; but I did not then see any very simple three-dimensional solution. After many unavailing efforts I have recently found the following.

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