C180 The Heaven of Chong Sect Has Fallen(1)

Roger was watching the alchemists' demonstration.

The iron box did not have any magic surges, but it recorded the sound and played it.

Frankenstein opened the iron box and took out the core component. "This is a recording disk made of many materials. It will cause a specific dent when it is hit by a physical impact. Then, you can use the needle to draw the dent to restore the vibration of sound