Lead: Matthew Brady made good on his vow to photograph many of the famous people of his generation.

 Intro.: A Moment in Time with Dan Roberts.

Content: Brady learned the technique of photography from Samuel F. B. Morse, artist and inventor of the telegraph. At first he used a process perfected in 1837 in France by Louis Jacques Mandé Daguerre. Over the next few decades, the daguerreotype was gradually replaced by the collodion wet-plate process which was more efficient.