National Museum of American History

This brass pantograph consists of four hollow bars with rectangular cross section. These are thirty-one inches and twenty-nine inches long, with the distance from the fulcrum to the points being twenty-eight inches. The bars slide on three metal wheels.

National Museum of American History

National Museum of African American History and Culture — GGN

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

National Museum of American History pictures: View photos and images of National Museum of American History

Inside the Smithsonian American History Museum's Pop Culture Exhibit

National Museum of American History — Museum Review

National Museum of American History - Wikipedia

National Museum of American History — Museum Review

National Museum of African American History and Culture

National Museum of Natural History - Wikipedia