We thank Alan Markworth at Battelle, Columbus for his continued thoughtful comments and suggestions on this project. We have also benefited from discussions with Don Weekley, Gregg Johnson, Andreas Rhode, Markus Löcher, and Earle Hunt at Ohio University regarding the experiment and the subtleties of nonlinear dynamics and chaos control. This work was supported in part by a Battelle subcontract of the Electric Power Research Institute (EPRI) research project contract RP2426-25 and by Ohio University Research Challenge Grant RC89-107.