While diving between helping with a class I stumbled over this piece of concrete. I retrieved a lift bag and recovered this cool chunk of history, now I need to know what it was used for. Some of the top is missing but "Feb 23 1904". The piece is shaped so as to fit together with others "combustion, Troy NY," are all clear. What ever it is I know it is old and has been resting at the bottom of the lake for sometime.
If anyone has info please message me.