In ancient times the upper story of the building housed 24 drums, of which only one survives. Its head is made of an entire ox hide and is 1.5 meters in diameter. A sword score on the side of the drum is a souvenir of the Eight-Power Allied Forces' invasion of Beijing in 1900.
In the Qing Dynasty, the hours were marked at night beginning at 7:00 p.m., a procedure that was popularly called "setting the watch." At this hour, the drums were sounded 13 times. After the watch had been "set" in this fashion, each subsequent two-hour interval was marked by a single drum beat. Civil and military officials oriented their lives around these time signals.
At the sounding of the third watch (1:00 a.m.) officials attending the morning court audience rose from there beds and at the fourth (3:00 a.m.) assembled outside the Meridian Gate (Wumen). At the sounding of the fifth watch (5:00 a.m.) they entered the ImperialPalace and knelt on the Sea of Flagstones (Haimen) before the Hall of Supreme Harmony (Taihedian) to await instructions from the emperor.
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