CC0 · no rights reserved
Patent model for weighing scale
From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.
About this work
This patent model demonstrates an invention for a balancing ball on a weighing scale; the invention was granted patent number 534839.
National Museum of American History’s own descriptionCredit linePatent model for weighing scale. ca 1870. Heyer, Charles A.. National Museum of American History. CC0.
