History Detectives

I'm watching History Detectives EPISODE 9 - August 21, 2006. The story is about a man in a prison for confederate soldiers who took clandestine photos of other prisoners with a lens that he happened to have in his pocket when he was captured. Using that and a cigar box he made into a primitive camera. Very cool. I just caught the end of it, they were trying to track down some guy's Grandfather. I'll have to see if I can catch a repeat. There is a script of the show that I could download but I don't know that it would have any more information. May someone will write a book about it.