Components of prototype Prieto batteries

Components of prototype Prieto batteries, 2014. The board holds several different types of cells for testing. Electrodes made with different combinations of copper foil, copper foam, and copper antimony are at the left. Standard paint sample color cards (center) are used to compare tests of the copper antimony substrate. A piece of copper foam is at the right. © 2014 Smithsonian Institution; photo by Richard Strauss. Courtesy of National Museum of American History; gift of Amy Prieto.