A collapsible network of similar pairs of nested Bennett linkages

Bricard's doubly collapsible octahedron gives rise to a set of analogous mobile networks. The “skew” variety, composed of Bennett isograms, is examined in a partly illustrative manner, thereby easing the tasks addressed. The four “non-hybrid” six-bars identified in the network are confirmed as identical with members of an established trio of hybrid six-bars but distinct from a “foldable” group. The six four-bars making up the eight-bar colligation are found to consist of three kinematically “similar” pairs.