Previous studies conducted in this laboratory on the vibrations of plates with joints were concerned primarily with rigid bar joints presenting essentially a one-dimensional constraint. Photographs of this system's nodal patterns clearly demonstrate transmission of those modes having nodal lines parallel to the joint, in agreement with theory, while for more complex patterns only the component parallel to the joint is transmitted. Present work centers about an investigation of multiple-joint and joint-stiffener rib combinations that approximate a two-dimensional constraint. Measurements made of the velocity distribution of freely suspended plates with such joints are discussed.