A N illumination system for a large cloud chamber in which Fresnel lenses are used is described. It is characterized by good collimation, uniform illumination, and ease and economy of construction.The construction and principal dimensions of the system are shown in the figure. The lenses, which are plastic condenser lenses taken from a Vu Graph projector,* are square (10! in.X 10! in.),
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.