Measures and Units:
H and D
[Etymology: F. Hurter; UK 1844-98 and V. C. Driffield; UK 1848-1915] photography See film speed.
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Copyrights:
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 | Measures and Units. A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved. Read more |
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