故宫铜大缸，又称“门海”。按质量可分为铜鎏金吉祥缸、“烧古”青铜缸和铁铸大缸三类。一类为铜鎏金吉祥缸，是比较贵重的，在故宫内的太和殿门前，就陈列着这种鎏金大铜缸，铜大缸尺寸每尊高1.2米，设计铸造铜大缸价格，直径1.63米，铜水缸缸的上部外表面均铭刻着“大清乾隆年造”的字款，铜大缸价格计算，大缸的两侧饰有兽面纹铺首环耳。第二类为“烧古”青铜缸，全部为清代制造，其外表油墨锃亮，非常雅致，在景运门和隆宗门前各有一对这样的大缸。第三类为明代制造的铁铸大缸，古朴素雅。

The big copper vat of the Forbidden City is also called "Menhai". According to the quality, it can be divided into three types: Copper gilded auspicious cylinder, "burn ancient" Bronze Cylinder and iron casting large cylinder. The first type is copper gilded auspicious cylinder, which is quite valuable. In front of the gate of Taihe palace in the Forbidden City, there is a large gilded copper cylinder. The size of each large copper cylinder is 1.2 meters high. The price of the designed and cast large copper cylinder is 1.63 meters in diameter. The upper surface of the cylinder is engraved with the word "made in Qianlong of Qing Dynasty". According to the price calculation of the large copper cylinder, the two sides of the large cylinder are decorated with animal face patterns to pave the first ring ears. The second type is "burn ancient" bronze tanks, all made in the Qing Dynasty, with shiny and elegant ink. There are two such tanks in front of Jingyun gate and longzong gate. The third type is the large iron cylinder made in Ming Dynasty, which is simple and elegant.

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