Originally broadcast as a segment of the television program Johns Hopkins science review on January 30, 1951 from the studios of WAAM in Baltimore, Md. Black and white. Lynn Poole, Sterling Reynolds, writers; Anthony Farrar, producer, director; Joel Chaseman, announcer; produced by WAAM television station in Baltimore, Md. for the Dumont Network. Lynn Poole, Robert Sleight, presenters. Digitized in 2003.