用手动或脚踏风箱供给强制气流，以提高火焰温度，后来用水轮机或兽力带动风箱。
A Bellows operated by an assistant or by a foot treadle provided the forced draft for raising the temperature of the fire. Later, a waterwheel or animal power was often used to operate the Bellows.
用手动或脚踏风箱供给强制气流，以提高火焰温度，后来用水轮机或兽力带动风箱。
A Bellows operated by an assistant or by a foot treadle provided the forced draft for raising the temperature of the fire. Later, a waterwheel or animal power was often used to operate the Bellows.
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