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Do you think it would be possible to discover Electricity, and some simple uses for it, like electromagnetic wired telegraphy before a time of industrialization? For example in Ancient Rome, Ancient China, or in Medieval Europe.

For example, sometime around 1300 or 1400, there would be a line of border fortresses in a European country as in OTL. There would be an electric telegraph line supported on utility poles running between one fortress and the other. One fortress could start punching away on the telegraph, which has a power source similar to the Daniell Cell, and the other fortress would receive it.

I've read opinions, that making copper wire that would be pure enough to reasonably carry electric current just wouldn't be possible without industrial technology. I've read other opinions that said that basic copper wire would've been possible even with Ancient Roman technology, just no one knew how electricity really works.

Which theory do you think is correct? Is there a possibility of a pre-industrial development of electricity?
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