Progress on accurate measurement of the Planck constant: Watt balance and counting atoms *
Li Shi-Songa),b),, Zhang Zhong-Huab),, Zhao Weia), Li Zheng-Kunb), Huang Song-Linga)
Fig. 12. The 5-kg monocrystal of the enriched material left and the plan to be manufactured right. [ 84 ]