H and D system

noun

: a system for determining the speed of photographic materials that is based on the characteristic curve and related to the inertia of the material

Word History

Etymology

after Ferdinand Hurter and Charles Driffield fl 1890

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Cite this Entry

“H and D system.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/H%20and%20D%20system. Accessed 19 Jul. 2024.

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