also

[eponine119]

Didn't they

Comments

[alliecat8]

I want to know how they knew there was electromagnetism there in the first place. How ancient WAS the well? Did ancient people really have compasses? How dumb am I that I don't know these things?

[eponine119]

They actually dug the well last week. ;)

kidding. I could google when compasses were invented -- and probably will now -- but I think they've been around for awhile.

ps

[eponine119]

The compass was invented in ancient China sometime before the 2nd century, and was used for navigation by the 11th century. The dry compass was invented in medieval Europe around 1300.[1] This was supplanted in the early 20th century by the liquid-filled magnetic compass.[2]