Daguerreotype
Morse met the inventor of the daguerreotype, Louis-Jacques-Mande Daguerre, in Paris in January 1839 when Daguerre's invention was announced [2]. While the daguerreotype fascinated Morse, he was concerned about how the new invention would compete with his telegraph. However, Morse's viewing of the daguerreotype alleviated his fears when he saw how revolutionary its technology was. Morse wrote a letter to his brother Sidney describing Daguerre's invention, which Sidney then published in the New-York Observer on April 20, 1839. While this was not the first report of the daguerreotype to appear in America, it was the first in-person report to appear in the United States.
Peter Britt
Until 1858 Britt could take only daguerreotypes or ambrotypes, processes that provided only the photo, no negatives or extra prints. About 200 of his daguerreotypes survive. Britt's first wet plate negative was taken of a trapper who agreed to sit for Britt's experiment.