Parallelopiped of Motions
Illustration used "If three component motions ab, ac, and ad are combined, their resultant af will be the diagonal of the parallelopiped of which they are the edges."
Peter Schwamb, S.B. And Allyne L. Merrill, S.B. Elements Of Mechanism (New York: John Wiley & Sons, Inc., 1905) 8
Courtesy the private collection of Roy Winkelman