Real applications system of ball and beam balancer?

Hi, every one. from now I am joint in this forum. I hope every one of you can help me for my final project.
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In this first moment I have a question.
what is the real applications system of ball and beam balancer ?
I hope all friend can help me answer my question ....
thankyou ...

to the best of my knowledge, ball and beam balancer is used in robotics. correct me if i am wrong..

Thank you for your attention Mr. Icehari
But I have some problem Can you give a specific answer for the real application of ball and beam ?
I hope you can help me sir, .....
thankyou ...