|Specified type||Historical materials|
|Designated date||August 5, 1980|
|location||Ichinoseki City Gumi-cho Character Okinono (Ichineki City Museum)|
61 cm in height.
Width 214 cm.
0.6 cm thick.
Katsura wood, bordered 1 sheet is a side price.
The account was dedicated to Hachiman Shrine in February 1941 (1741), and the dedicated person Iwasaki Kiyoremon completely understands the Tenshu technique created by Seki Takakazu and is correct. We derive an open method (currently called an equation).
The existing calculation is as old as the whole country, and it is valuable in the study of mathematical history in this prefecture.
In addition, a license certificate has also been handed down, indicating that Iwasaki Seiryon Amon has been transmitted from the master Aoki Nagayoshi to the secret of the Nakanishi style.