Meanwhile, the volume of Kosho (810 cubic bu) was defined as 1 yaku (0.5 go [a unit of mass]), and the mass of 1,200 grains of black mille, which could fill up the inside of Kosho, was defined as 12 shu (0.5 ryo [a unit of mass]).
さらに黄鍾の管の容積（810立方分）を1龠（0.5合）、黄鍾の管に入る秬黍1,200粒の質量を12銖（0.5両）とした。