National Museum of American History

This 51-1/2" wooden T-square has a scalloped top piece attached to the handle by 6 brass screws. A hole at the end of the handle is for hanging the instrument. It has no markings, but paint and ink stains on the handle indicate it was heavily used.

Smithsonian National Museum of American History - Cinnabar

Smithsonian Institution, National Museum of American History

Review: The National Museum of African American History and Culture - Biracial Bookworms

Smithsonian Institution National Museum of African American History & Culture — Davis Brody Bond

National Museum of African American History & Culture – Silman - Structural Engineering

Visit National Museum of American History

Guide To the National Museum of African American History and Culture

Smithsonian Museum of American History

Smithsonian National Museum of American History - Cinnabar

The National Museum of American History: Abbott, Shirley: 9780810913639: : Books