This brass instrument combines a set square and a portion of a protractor. A scale along the outside of the long beveled edge of the set square is divided into units about 15/16 inches long, subdivided to twentieths. A scale of equal parts runs along the curved rim which is adjacent to and outside the short edge of the set square. Neither scale has numbers.
The object was received with group of Japanese instruments exhibited at the Centennial Expositon, a world's fair held in Philadelphia in1876.
Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.
If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.