On variations in the threshold speed of
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E.R. Bullock
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Article
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1926
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Elsevier Science
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English
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FOR every emulsion, at a given temperature, there is an optimum development time at which the minimum light-exposure is just rendered visible, that is at which the threshold (Schwellenwert) speed of the emulsion is a maximum. For a given slow emulsion the maximum threshold speed is primarily depende