Hyperallergic posted an article about the historic process videos that George Eastman House produced:
"George Eastman House released a 12-part video series last month that examines the history of photography from the perspective of its technology. Photographic Processes Series, available on YouTube, starts with the silhouette and traces photography’s development through daguerreotypes, cyanotypes, Kodachrome, and right up to digital."
See entire article here.