宫内的铜大缸是用来防火的。每尊铜缸可贮水3000多升，如同一座座小水库。这些大缸，过去由十几个太监专门负责管理，每天派杂役从井内取水，一担一担地把缸打满，夏天要保证水质干净，没有异味。冬天除在缸口加盖之外，还在缸外包上一层棉外套，另外，在特别寒冷的季节里，要把缸架在特制的石圈上，在石圈内点燃炭火，昼夜不熄，使缸内不冻，直到大地回春。这样，始终做到有备无患，某处一旦失火，就用这些大缸里的水扑救，以此保证故宫的安全。

The copper VAT in the palace is used for fire prevention. Each copper tank can store more than 3000 liters of water, just like a small reservoir. In the past, a dozen eunuchs were in charge of the management of these large tanks. Every day, they sent workers to take water from the well and fill the tanks one by one. In summer, they should ensure that the water quality is clean and there is no peculiar smell. In winter, in addition to capping the cylinder mouth, a layer of cotton coat is also wrapped around the cylinder. In addition, in the particularly cold season, the cylinder should be mounted on a special stone ring, and the carbon fire should be ignited in the stone ring, which will not be extinguished day and night, so that the cylinder will not be frozen until spring returns. In this way, always be prepared. In case of a fire, use the water in these tanks to put out the fire, so as to ensure the safety of the Forbidden City.

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