• http://inventors.about.com/od/pstartinventions/a/Photography.htm
• 1840
  First American patent issued in photography to Alexander Wolcott for his camera.
• 1841
  William Henry Talbot patents the Calotype process - the first negative-positive process making possible the first multiple copies.
• 1843
  First advertisement with a photograph made in Philadelphia.
• 1851
  Frederick Scott Archer invented the Collodion process - images required only two or three seconds of light exposure.
• 1859
  Panoramic camera patented - the Sutton.