The bath in black

Bath were heated in black. "What is it?" - You will ask. All the smoke from the stone oven is located inside the baths. Pipe of a bath there. Even the smoke escaped through a small hole in the top of the baths. In the bath, in the near left corner, at the door of the oven of stone, without the tube. Along the right and rear walls are drawn the benches. This massive bath hardly anyone saw.