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九龍杯之構造
九龍杯,
酒器也。傳為明
季巧匠所創,杯內豎一龍
首,龍頸於杯底有小孔,杯之外底之中亦有一孔。持此杯飲,不可過盈,則與常杯無異。若過盈,則酒從底孔出之殆盡。故亦名公道杯,
戒貪杯
。
其理,蓋虹吸耳。龍頸內有複管,其內管上與外管通,下連杯底之孔,外管則俱封,惟開小孔內底,即龍頸之孔也。若夫斟酒不盈於內管之上口,則酒不稍出;若高之,則酒盈於內外管壁間,儼然虹吸之態,故酒循內管出之殆盡也。
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