(GB2100806-B)      In the appts., waves roll freely along upwardly-sloping plate from the intake side to the out-take side and into a depression which merges at a sharp front edge of intake plate into duct. The initial part of duct is directed backwards towards the intake side in such a way that the inherent kinetic energy of waves rolling along intake plate is released.    The water particles travelling forwards in the direction of the wave motion and the particles travelling backwards in their rotation along circular paths in the waves are caused to flow in the same direction as each other through the duct from the out-take side of intake plate through a turbine which is connected to the downstream end of duct. The intake plate is provided with side walls which converge from the intake side to the out-take side. (4pp)    (US4521152-A)      The apparatus comprises a coherent intake plane (1) extending continuously from the intake side (2) to the outtake side (3), along which intake plane the waves are to roll freely from the intake side side (2) to the outtake side (3). A duct (5) includes an entrance portion connected to the plane (1) and directed substantially beneath the plane toward the intake side (2).    The entrance portion defines a depression (4) into which the waves fall, breaking the water particles from their respective circular paths and causing them to flow in substantially the same direction in the duct (5) for delivery to an associated energy converter. The apparatus is adjustable so as to adapt itself to changes in the slack-water surface. The inclination of the intake plane is also adjustable so as to adapt itself to the wave height. (4pp)    (EP82852-B)      Apparatus for extracting the inherent kinetic energy from waves, characterised by comprising a coherent intake plane extending continuously from the intake side to the outtake side, which plane inclines upwards as counted from the intake side, the inclination of the intake plane being at most 1:7 and along which plane the waves are to roll freely from the intake side to the outtake side and, provided at the outtake side of the intake plane, a depression which, via a sharp front edge of the intake plane, merges in a duct directed backwardly in such a way that the inherent kinetic energy of the waves is released for the reason that the water particles travelling forwards in the direction of the wave motion as well as those travelling backwards, which rotate in circular paths, are caused to flow in one direction through the duct which is connected to an energy converter, for instance a turbine. (5pp)