Pelamis Wave        Salter's Duck

Salter's Duck
This device, the first of the wave power devices, is an egg-shaped device that moves with the motion of the waves. Two sets of cables are attached to the device, one to a pendulum inside the device and the other to a fixed arm outside the device. The cables attached to the internal pendulum contain hydraulics, which pump as the device rocks back and forth with the waves. This movement of the pressurizes oil, which is pumped into hydraulic motors that power electric generators.