How do you record sound on pottery?

With difficulty. One might be able to cut groves in the surface and use it in the manner of the wax cylinders on the old sound machines. It may be possible to cut, burn or etch a "code" onto the surface of a pottery piece and recover the data string and convert it to sound. It may also be possible to make a piece of pottery with a very smooth surface on it and using a finely distributed ferromagnetic material in the slip from which the item was made. That would set the stage for being able to use the outer surface (and, with even more difficulty, the inner surface) like magnetic tape is used or like a magnetic disc in a computer disc or hard drive is used. Rig up a small arm with a read/write head on it and position it just above the surface of the spinning piece of pottery and presto! Your pottery jug has become a jug drive.

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