Fa Tie Sanxi Hall, the full name of which is Fa Tie Baodi Shiqu Sanxi Hall Royal Sculpture. In the 12th year of Qianlong reign (1747), the emperor ordered Shang Shuliang and Jiang Pu in the official department to select the best calligraphy works from the palace collection and carve them into volumes, which are now on the drum tower wall in Beijing Beihai Park.
The last four words should be shiqu Baodi!