Wooden bellows boards y torno de cuerda: qué tienen en común

1. Paso 1. Wooden bellows boards — forma parte de — Fuelle. Rigid walls.
2. Paso 2. Fuelle — forma parte de — Alto horno. Air was blown in by bellows, later by blowers.
3. Paso 3. Alto horno — está hecho de — Piedra. The shaft of a blast furnace is stone.
4. Paso 4. Piedra — es material para — Pozo. The walls of wells were lined with stone.
5. Paso 5. Pozo — utiliza — Torno de cuerda. The bucket was raised with a windlass.

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