I remember one of the "pot" type oil furnaces at my grandma's place. It was a brown glazed metal, about the size of one of the old woodstoves, obviously made to replace such a stove. If I remember correctly, the oil was siphon fed and you had to light it manually. It had a fairly large compartment that you could remove the burning bowl from for cleaning; I vaguely remember that it was also used to burn papers and things in, although I'm not sure if that was a valid use or not.
