The most common recurrence
The most common recurrence of the perpetual-motion idea since the thirteenth century. Inviting to look at, but the resolution of forces in the individual arms and balls demonstrates the equilibrium of forces and its inability to move.
(Subsection 920, from p.368)
From: Gardner D. Hiscox, M.E., Mechanical Appliances and Novelties of Construction (1927), Norman W. Henley Publ. Co.