Named after the producer Mao Gong, it was unearthed in Qishan, Shaanxi (now Qishan County, Baoji City) in the 23rd year of Qing Daoguang (1843).
There are inscriptions on the inner wall of Mao, 32 lines and nearly 500 words, which are the longest inscriptions in existing bronzes and the most in the Western Zhou Dynasty. With a complete narrative and detailed records, it is known as "a historical book" and is an important historical material for studying the political history of the late Western Zhou Dynasty.
This tripod was cast during the Zhongxing period in Zhou Xuanwang, when the country was in Changping, and it was a scene of harmony and prosperity. Judging from the shape of the tripod, it is round and dignified in shape, simple and smooth in decoration, simple and rough, and it is indeed a rare boutique in bronze ware. The content of the inscription describes Wang Xuan's admonition to Mao Gong (the owner of the tripod), so Mao Gong solemnly cast the tripod.
It can also be seen from Ming Ding's words that the writers at that time were thoughtful in layout, respectful and solid in writing, and meticulous and decent in writing. The writer seems to have a heart-to-heart meaning, and he thought of it with a stroke of his hand. The style of the book is both rigid and flexible, and the artistic conception is suitable. The book and the text are very good and perfect. The magnificent 500-word masterpiece is like a string of stars, like the sequence of four seasons, which shows the great beauty of calligraphy art, so Baoding has doubled its value and become a rare and precious instrument.