"Found this by the campfire. Has a glass water compartment attached, with a hole on the top. The water doesn’t escape the hole very well. Any idea of it’s purpose/use?"
A: "I have one of these. It’s an oil lamp. The glass is filled with lamp oil and there is a wick that soaks the oil and protrudes out the top of the rock through the small hole so that the flame looks like it is floating on the rock slab. I rarely use it because it requires a small funnel to load the oil from the top and I find it burns too quickly because of such a small oil reserve."
I have one for each of my extension cords.
Pur coals inside and then place under covers.