Floating aerator having means to vary the length of the draft pipe

A water circulating device for circulating and aerating the water in a lake, pond, or reservoir comprising a floatation raft, a shaft rotatably mounted on said raft to rotate about a vertical axis, a wind drive motor for driving said shaft, a cylindrical mixing chamber mounted beneath said raft, said chamber having a cylindrical side wall and a bottom wall and having an opening formed by the side walls upper edge located above the surface of the lake, pond, or reservoir, said shaft projecting downward into said mixing chamber, a propellor mounted to the lower end of said shaft within the mixing chamber, a plurality of vertically elongated pipes, said plurality including uppermost and lowermost pipes, said pipes being mounted in telescoping relation with the uppermost pipe fixed to the bottom of the mixing chamber, said chamber having an opening in the bottom communicating with said uppermost pipe, said lowermost pipe being slidably mounted relative to said raft and said uppermost pipe, means on said raft to selectively adjust said lowermost pipe upward and downward relative to the raft and the uppermost pipe and relative to the bottom of the lake so that the lowermost edge of the lowermost pipe may be located near the bottom of the lake, said propellor having pitched blades, so that upon rotation of the propellor in the chamber by the wind driven motor rotating the shaft, the propellor in the chamber will draw water up from the bottom of the lake into the lower end of the lowermost pipe up through the plurality of pipes into the mixing chamber, with the water moving upward to the surface and over the upper edge of the side wall to aerate the water.