渴乌,或称 “注子”、“偏提”、“过山龙”。古代供水器材,是利用大气压力引水的汲水曲竹筒。

渴乌即现代物理学所称的虹吸管东汉中平三年(186年)掖庭令毕岚“作翻车、渴乌,施于桥西,用洒南北郊路”[1]方以智称这类器具为“过山龙”[2]。1977年出土的安徽阜阳汉墓竹简中已发现有这种器具的文字记载。

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