在清代，宫中的铜缸是由内务府统一管理的。每天一早，内务府官员便命苏拉（杂役）从井内汲水，一担一担地把所有大缸灌满，以备防火之用。每年到了小雪季节，宫内的太监就要在铜缸外套上一层特制的棉套，上面再加上厚厚的缸盖。同时在铜大缸下的汉白玉石基座里放置一盆炭火，并保证其昼夜不息地燃烧着。这样，通过双重保暖措施，防止缸内的存水结冰。保暖工作一直要到第二年的惊蛰时节才能结束，那时大地回春，气候已经逐渐转暖，太监们就会解去棉套，撤去炭火。为了保证宫中有足够的水源用于灭火，当时在宫中设置了许多大缸。据《大清会典》记载，宫中共有大缸308口。In the Qing Dynasty, the copper cylinders in the palace were under the unified management of the Interior Office. Early in the morning, the officials of the house office ordered Sura to collect water from the well and fill up all the large cylinders with a single load, so that they could be used for fireproofing. Every year in the snowy season, the eunuch in the palace will put a special cotton jacket on the outer jacket of the copper cylinder, with a thick cylinder head on it. At the same time, a basin of charcoal fire is placed in the base of Han Baiyu stone under the copper vat, and it is guaranteed to burn continuously day and night. In this way, the water stored in the cylinder can be prevented from freezing by means of double warming measures. The work of heat preservation can't be finished until second years of waking up. When the weather returns to the spring, the eunuch will remove the cotton and remove the charcoal fire. In order to ensure that there was enough water for fire extinguishing in the palace, many large cylinders were set up in the palace at that time. According to the Daqing Huidian, there are 308 large cylinders in the palace

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