Abstract: A machine for making (gravity) waves on the free surface of a body of water comprises a platform for machinery having a deck level which is raised above the surface of the water, driving machinery located on the platform for generating reciprocating hoist action, a weighted paddle blade suspended below the surface of the water in a horizontal attitude alongside the machinery platform, suspension means extending from the driving machinery to the weighted paddle blade for imparting vertical oscillations to the paddle blade while maintaining the generally horizontal attitude of the paddle blade.

Abstract: A wave making machine for substantially unidirectional wave making on a water surface comprises at least one support scow, a plunger supported by each scow by means of a linkage which limits the movement of the plunger to substantially vertical movement and a drive mechanism for driving the plunger between a raised position and a lowered position. The plunger has a front face at least a portion of which is upwardly and forwardly inclined and a back face which is substantially vertically oriented whereby upon periodic motion waves are generated at the front face and substantially no waves are generated at the back face of the plunger. A plurality of scows, each supporting a wave making plunger, may be connected in a side by side relationship to form a laterally elongated wave making mechanism. The scrows are connected by movable linkage mechanisms which permit independent movement of each adjacent scow.

Abstract: A machine for making waves on the free surface of a body of liquid comprises a member which is buoyant in the liquid, driving means mounted on and supported above the free surface of the water by the buoyant member to cause a periodic motion thereof relative to the surface of the liquid between a raised position and a lowered position, such relative motion causing substantial variations in the liquid displacement of the buoyant member, said buoyant member comprises a longitudinally elongated wave making plunger, floatation means underlying said wave making plunger for supporting said wave making plunger with its longitudinal extent horizontally disposed at a level with respect to the free surface of the water when in use such that the plunger displacement is substantially zero when in said raised position.