One of our favorite exhibits at the Museum of Science Boston is their mechanism wall. We use examples of mechanisms when building or constructing contraptions and other devices. Here's a set of video clips demonstrating the mechanical movements that we refer to most often, plus a few that we're still trying to figure out. Check out the exhibit when you find yourself in Boston. -Karen/Mike
46

Reciprocating Rectilinear Motion
   
152

Vertical Engine
     
149

Double Quadrant Steam Engine
146

Trunk Type Engine
150

Rotary Engine
     
12

Slotted Cross Head
151

Eliptical Gear Engine
148

Oscillating Piston Engine
     
16

Off-Center Treadle