Modern photography in theory and practice : a hand book for the amateur (1899)
Abbott, Henry G., 1858-1905 · Chicago : Geo. K. Hazlitt · leaf 281
IN THEORY AND PRACTICE. 237 The Sandell non-halation plate is coated with two ot three films of different degrees of sensitiveness, the one film being much more sensitive than another. It is … Fig. j6. probable that where the surfaces of two films unite they form gradations equivalent to having a number of films, each of a different degree of sensitiveness. This very
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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