NOTE: Because the Reading Eagle listed this as "Oscar's Balance Beams" I assumed that was correct. I have now learned it was Bert's Balance Beams and also sometimes listed on signage and printed materials as Bert's Balance Boards.
Image from Photobucket
A 1983 Reading Eagle article refers to it as Oscar's Balance Beams and writes:
Oscar's Balance Beams provide a chance for skillful adventurers to make their way across the balance beams over gentle geysers of water.The image above looks like it could certainly be this attraction. The background looks like it would put this attraction in area behind Rubber Duckie Pond (now Elmo's Cloud Chaser.)
In the background we see a sign that reads Bert's Balance Boards. The signs would often be swapped out as they faded in the sun.