h and d speed

h and d speed
\\|āchənˈdē-\ noun
Usage: usually capitalized H&D
Etymology: after Ferdinand Hurter and Charles Driffield fl 1890
: a number indicating the sensitivity of a photographic emulsion determined by the method of Hurter and Driffield

Useful english dictionary. 2012.

Игры ⚽ Поможем сделать НИР

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