Plate VII from "The Silver 'Grain' in Photography" by Robert James Wallace, The Astrophysical Journal, Vol. XX, No. 2, Sept. 1904, pp. 113–122, Chicago. As reproduced by Google Book Search. See also [1].
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2007-12-10 06:57 Dicklyon 666×861× (326909 bytes) Plate VII from "The Silver 'Grain' in Photography" by Robert James Wallace, ''The Astrophysical Journal'', Vol. XX, No. 2, Sept. 1904, pp. 113–122, Chicago, as reproduced by Google Book Search [http://books.google.com/books?id=nJAsAAAAIAAJ&pg=PA113&dq=w
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