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The musical mirror of Ktesibios (3rd c. B.C.)

It is the first invention of the most important inventor of antiquity who sought to solve the problem of an adjustable mirror at the height of each client, solving the problem he noticed at his father’s barber shop.
To counterbalance for the weight of the mirror, he did not simply use counterweights but pistons applied to cylinders that had different length musical pipes placed on their closed end, thus producing different musical notes. When the mirror was lifted or lowered by its operator, the timed pistons descent based on the planned free length of the last one suspension ropes pressed the trapped air and automatically produced a specific melody. If the musical pipes were repositioned with different matches on the cylinders, then any other melody they desired could be achieved.