(a)
(b)
Figure 6.3 Motion sequence of a threefold-symmetric Bricard linkage with
α = π /4. (a) The configuration of planar equilateral triangle and (b) the
configuration in which the movement of linkage is physically blocked.
(a)
(b)
(c)
Figure 6.4 Motion sequence of a threefold-symmetric Bricard linkage with
α = 5π /12. (a) The configuration of planar equilateral triangle, (b)
and (c) the configurations during the process of movement.