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1. Helmut Gernsheim, The Origins of Photography, rev. 3rd ed. (New York: Thames & Hudson, 1982), 86.

2. Benjamin J. Lossing, "Professor Morse and the Telegraph," Scribner's Monthly Magazine 5 (March 1873): 584; see also Paul J. Staiti and Gary A. Reynolds, Samuel F. B. Morse, exhibition catalog (New York: Grey Art Gallery, New York University, 1982), 80-81.

3. Lossing, "Professor Morse," 585.

4. Ibid., 584.

5. Ibid.; see also Henry Hunt Snelling, The History and Practice of the Art of Photography (New York: G. P. Putnam, 1849), 7-8.

6. Ibid.; see for example Samuel Irenaeus Prime, Life of Samuel F. B. Morse (New York: D. Appleton and Co., 1875), 400-402; Carleton Mabee, The American Leonardo: A Live of Samuel Morse (New York: Alfred A. Knopf, 1943), 226-27.

7. Ibid., 227; Prime, Life of Morse, 400-402.

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