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Hurter and Driffield began groundbreaking work on the light sensitivity of photographic emulsions in 1876. Their get the job done enabled the very first quantitative measure of movie velocity to get devised. Clear prints of the images could be projected through comparable shade filters and superimposed about the projection display https://www.youtube.com/channel/UCOhvCyjfJHUz5Re6214GX0g

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