“I’m a pretty good detective,” Jane Klain said, but she is no badge-wielding, revolver-packing gumshoe. She is in charge of research services for a museum.
The latest product of her sleuthing was playing on a computer on the desk behind her — a 104-minute performance of “The Glass Menagerie” starring Shirley Booth, Hal Holbrook and Barbara Loden that was broadcast 50 years ago. As far as anyone knew, the master videotape was lost.
Ms. Klain, who works for the Paley Center for Media, formerly the Museum of Broadcasting and the Museum of Television and Radio, is always on the lookout for…