Jialiang

The passage describes the construction of one that includes three measures, fu (釜), dou (豆), and sheng (升); furthermore, the instrument weighs one jun (鈞) and its sound is the gong of huangzhong (黃鐘之宮).

The earliest known jialiang was made in the first year of Wang Mang's short-lived Xin dynasty (9–23 CE), in order to standardize the measurements across the empire.

Investigations on the jialiang were undertaken by such scholars as Liu Hui of the Three Kingdoms period and Zu Chongzhi and Li Chunfeng of the Tang dynasty.

According to the research of modern scholar Liu Fu 劉復, at the time of its creation, following its measurements, the standard units correspond to the modern metric system in this way: 1 chi (尺) was 23.1 cm; 1 sheng (升) was 200 mL; and 1 jin (斤) was 226.7 g. [3] In Beijing's Forbidden City, before the Hall of Supreme Harmony and the Palace of Heavenly Purity, there are two jialiangs cast during the reign of the Qianlong Emperor, a square one in front of the Hall of Supreme Harmony and a round one in front of the Palace of Heavenly Purity.

[4] The jialiang and the adjacent sundial (rigui 日晷) have been described as symbolizing the sovereignty and unity of the imperial reign[5] or emphasizing that the emperor is just and fair.