1856 Bowery, New York, New York.
Knapp was recorded on January 1, 1856 in the Photographic and fine Arts Journal (New York, New York). In an article entitled the Photographic Galleries of America. Number One, New York. The author visited 69 Galleries in New York City.
Knapp’s, Bowery. No specimens on which to form a judgment.
 Not all first names or complete addresses were recorded in article. Craig’s Daguerreian Registry was used to assist in identification when possible first name and address were added.
Knapp is unknown and not recorded in other photographic directories as being active on Bowery in 1855-1856 . William R. Knapp was listed in an advertisement in the New York Daily Tribune on March 22,1854 as being formerly at 103 Bowery. Its possible that someone is still using Knapp’s name to attract business. similar cases are Plumbe’s Galleries and Root’s (Samuel A.)