Old Coal Furnace -- Western PA
As many others mentioned -- our 1860's farmhouse had 4 rooms & 4 fireplaces; the house had a "one-lunger" in the basement
that had been added sometime before 1930. This was a circular grate furnace with a "plenum" hanging on the side to heat the air which then rose (together with plenty of soot) into the house. It is down over the hill (thought about getting last summer
when scrap peaked at US $400/t) House is now heated quite nicely with hand fed stove -- Anthracite!