The daguerreotype process, or daguerreotypy, was the first publicly available photographic process. For nearly twenty years it was the one most commonly used. Invented by Louis-Jacques-Mandé Daguerre and introduced worldwide in 1839. The daguerreotype was almost completely superseded by 1860 with new, less expensive processes. In the late 20th century, there was a revival of daguerreotypy. A small number of photographers are interested in making artistic use of early photographic processes. Read more here: daguerreotype. In 1851 wet plate collodion process was invented. You can watch more wet plate portraits here – Michał Sitkiewicz – Wet Plate Collodion Portraits.