A photographic method utilizing a stereo view is applied to both an experimental analysis of three-dimensional motion and a planar elastic mechanism. The spatial motion generated by the coupler of a Bennett mechanism is analyzed and compared with analytical predictions. Also, this method is applied to the study of the three-dimensional kinematics of the human chewing function. The motion of the elastic extension to the coupler link of a planar four-bar linkage is also analyzed to illustrate the application of this technique for the dynamic analysis of high-speed machinery. These examples demonstrate the potential general utility of this experimental analysis tool which yields linearity and high resolution in analyzing three-dimensional motion.