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AMS signed and dated one day before his death, "Ludwik Silberstein, Rochester, N.Y., January 16, 1948," eight pages on four sheets, headed: "The Effect of Clumping on the Size-Frequency Distribution and on the H. and D. Curve of an Emulsion." In this evidently unpublished handwritten technical manuscript, Silberstein discusses the clumping of grains in a photographic emulsion as it pertains to the film characteristic curve (the relationship between the optical density and relative exposure). In overall fine condition. Accompanied by a newspaper clipping of Silberstein's obituary from the Rochester News, published January 18, 1948, which makes note of his long-term consultancy with the Eastman Kodak Company ("For 28 years he had been a consultant in mathematical physics on the application of various theories to photography"), in addition to his place as an authority on relativity.