"Lodge : Originally an insubstantial dwelling, or one erected for a temporary occupational purpose (e.g., woodcutting or masonry) or for use during the hunting season."
Their thick masonry walls insulated against the heat, and the vertical air shafts between the buildings give at least some airflow to stifling tenement rooms.
Removing the fire-board from the front of the try-works, the bare masonry of that side is exposed, penetrated by the two iron mouths of the furnaces, directly underneath the pots.