| The RESONATOR consists 
              of two flexible spring-steel bars of different lengths attached 
              to a motor-driven vibrating table. The vibrations cause the bars 
              to wave back and forth, and at certain frequencies one bar or the 
              other will resonate. At these resonant frequencies, the bar will 
              display beautiful nodes and antinodes. The exhibit automatically 
              runs through different motor speeds, or the motor speed can be manually 
              controlled. |   |