Daguerreotype
Invented by Louis-Jacques-Mandé Daguerre and introduced worldwide in 1839, daguerreotype was almost completely superseded by 1860 with new, less expensive processes yielding more readily viewable images. In the late 20th century, there was a revival of daguerreotypy by a small number of photographers interested in making artistic use of early photographic processes.
John Jabez Edwin Mayall
Six nations: the United States, England, France, Italy, Germany and Austria exhibited 700 daguerrotypes in a special section of the Great Exhibition devoted to Daguerreotypes and Calotypes. It is considered the first international photography competition. Mayall exhibited 72 daguerreotypes in the photographic section and he received an Honourable Mention in the jury's official report on the photographic exhibits. Three of the five medals awarded to daguerreotypes went to the Americans Mathew Brady, Martin M. Lawrence and John Adams Whipple.