caminus

Camīnus is Latin, from Greek kaminos, meaning a furnace or oven. In both languages, the word named the fire itself — the heating device, the enclosed space where combustion happened. When Old French borrowed it as cheminée, the word expanded to include the fireplace, the hearth, and the mantel. The word was still about heat. It named the place of warmth in a house.

The chimney as a vertical smoke shaft is a medieval development. Roman houses used openings in the roof or walls to vent smoke. The dedicated chimney — a vertical tube built into the wall to draw smoke upward and away — appeared in northern Europe by the twelfth century. The word migrated from the fire to the structure above the fire. In English, chimney came to mean the shaft and the visible structure on the roof, not the fireplace below.

Chimneys transformed domestic life. Before the chimney, houses had a central hearth with a hole in the roof. Smoke filled the room. Soot blackened everything. The chimney moved the smoke outside, which made multi-story buildings practical — you could build a room above the fireplace because the smoke was no longer in it. The chimney made the upper floors of buildings habitable.

Chimney sweeps became a profession and a social problem. Small boys — some as young as four — were sent into chimneys to clean the soot. Charles Kingsley's The Water-Babies (1863) and Blake's 'The Chimney Sweeper' poems (1789, 1794) made the child sweep a symbol of industrial exploitation. The Greek word for a furnace, which became the English word for a smoke tube, became the symbol of the children who were sent into it.