Mike Carrell wrote:
there. Batteries have been dated to ca. 200 BC, but no envidence that anyone brought a current carrying wire near a compass until the 1700s.
Yes, apparently they were used for therapy, like massage. Modern doctors have found low current helps some patients.
There are ancient Egyptian artifacts that very stongly suggest they were made with machines such as lathes. Exquisite metalwork is seen in tomb artifacts, so it is dangerous to assert that an Edison foil pnonograph could not have been built.
As I said, I do not know about other ancient civilizations, other than Europe, China and Japan. I do not know what the Egyptians accomplished.
- Jed
