The photographs were located by Archives Supervisor, Barbara Krieger in ML49, Box 5, Folder 2, Young papers, Rauner Special Collections Library, Dartmouth College. The discovery was communicated to me by Special Collections Librarian Jay Satterfield on 12 June 2013. Images of the photographs are reproduced here for the first time with the kind permission of Rauner Special Collections Library, Dartmouth College.
2.
HugginsW. to YoungC. A., 14 July 1889, ML49, Box 6, Folder 154, Young papers, Rauner Special Collections Library, Dartmouth College.
3.
BeckerB. J., “Priority, persuasion, and the virtue of perseverence: William Huggins's efforts to photograph the solar corona without an eclipse”, Journal for the history of astronomy, xxxi (2000), 223–43; Unravelling starlight: William and Margaret Huggins and the rise of the new astronomy (Cambridge, 2011), chap. 11.
4.
HaleG. E., “On some attempts to photograph the solar corona without an eclipse”, Astronomy and astrophysics, xiii (1894), 662–87, pp. 664–6.
5.
HugginsM. L., 15 December 1882, January 1888, 16 April 1888 and 30 April 1888, Notebook 2, Huggins Collection, Special Collections, Margaret Clapp Library, Wellesley College.
6.
BeckerB. J., Selected correspondence of William Huggins (2 vols, London, forthcoming).
7.
HugginsW. to HoldenE. S., 13 July 1889, Holden papers, Lick Observatory Archives.