I just make "M" like something on testing, this's another link related to bridge.
http://www.okanagan.bc.ca/Assets/Departments+(Education)/Engineering+Technologies/Mechanical+Engineering/Spaghetti+bridge+load+machine.jpg
http://www.globaltvbc.com/assets/0/105/70dda52e-66ac-446d-8869-db08fa2b7964.jpg?size=sw380nws