It was noticed recently that the pot in my drawing above has its handle on the side. I've owned this antique jug for so long, that I'd forgotten how odd this may appear.
My only explanation is that it was originally used to heat some liquid (milk maybe?) against a fire, thus leaving the handle cool enough to grasp.
What I am sure of is that all such jugs are the same, having one scorched side and one non-scorched side (where the handle is), suggesting that my theory is correct (not sure if this is very clear in the pic). But why would anyone want to heat milk, or any other liquid, in a jug?
If you have any further theories, they would be appreciated.