How was the sound variation traced on Edison's early wax cylinders?

Answer

Vertically (up and down)

A key characteristic of the cylinder format was that the groove was cut vertically, meaning the stylus moved up and down to trace the sound variations.

How was the sound variation traced on Edison's early wax cylinders?

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Emile Berliner, Kammer & Reinhardt Gramophones, First ... - YouTube

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