If other dissimilar metals are used, care must be taken to ensure correct polarity. Connections to the watch in the wrong polarity could damage the quartz crystal. For example if magnesium ribbon and iron are used, the magnesium must be connected to the negative end, and the iron to the positive end of the battery terminal.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.