Everyone gathered together.
"Big Tree" went to fetch his donkey back.
The black spots were still spreading, but their color had faded.
Ma Lin still thought it was some kind of acid poisoning.
Everyone drank a few cups of boiled water, then sat down for a leisurely chat.
Ma Lin went to inspect a few pieces of ore he had brought back.
Without a doubt, he had found copper.
Why the top of the copper mine looked that way, he wasn't sure, but it was definitely unexpected.
Carrying over a dozen pounds of copper ore, he went to find "Smarty Pants" and asked him to extract the copper using a clay furnace.
"Crush this piece of ore into powder, mix it with charcoal powder, and burn it in the clay furnace with the bellows. Copper has a lower temperature requirement than iron."
They could even smelt steel, so copper would naturally be no problem.
Then he went back and started calculating the optics.
What's the principle of a microscope? What's the principle of a telescope?
