National Museum of American History

A wooden bar (6-1/8" x 2" x 3/4") is attached to a flat wooden handle (17-7/8" x 2" x 1/8") by nine wooden pegs. By the 17th century, draftsmen used T-squares to help them draw horizontal lines.

National Museum of African American History & Culture

National Museum of American History print — Victory Dance Creative

National Museum of American History Reviews

National Museum of American History (Smithsonian): The District

3,600 Smithsonian Museum Images, Stock Photos, 3D objects, & Vectors

National Museum of American History

Exhibitions National Museum of African American History and Culture

Smithsonian National Museum of American History Renovation di SOM - Skidmore, Owings & Merrill

Smithsonian National Museum of American History Renovation di SOM

National Museum of American History, Washington, DC - Book Tickets

Smithsonian National Museum of African American History and Culture by David Adjaye: Commemorating America's Black heritage - RTF

National Museum of American History, Washington DC

Smithsonian National Museum of American History Renovation di SOM - Skidmore, Owings & Merrill

Smithsonian National Museum of American History Renovation – SOM

National Museum of American History