====== Self-Synchronizing Metronomes ======
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Several metronomes set at the same frequency but running initially out of phase self-synchronize due to the coupling permitted by a freely rolling base. 

M1

===Setup===
To set up: 
  - wind up the metronomes fully
  - place metronomes on top of the board on the marked locations
  - release the metronomes
  - place styrofoam board on top of the cans, which should be placed near the ends of the board
  - observe as they match modes (note, you can get an out of phase metronome out of the five; this is possible since this is another stable solution; try adjusting the positions until you get the completely in phase solution)
  - for fun, you can set the second and fourth metronomes at a different frequency (second and fourth are equal, though) from the other three - which have same frequency. you will get the normal modes for an alternating two mass system

PIRA DCS 3A70.XX