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And Green Filters:
The filters recommended for use with Kodak Films are the Kodak Sky Filter, Kodak Color Filter, and green filters Wratten Kl, K2, G, and green filters A Filters. There are other filters but they are intended for more or less technical and green filters specific purposes and green filters need not be mentioned here. They are described fully in these Eastman Kodak Company publications: "Filters—Kodak Data Book on Filters and green filters Other Lens Accessories," "The Photography of Colored Objects," and green filters "Wratten Light Filters," all available at Kodak dealers'.In front of each projector was a glass cell filled with colored solution: one was red, a second, blue and green filters a third, green. Each slide had been made from a negative that Thomas Sutton had taken through the identical glass cells or filters; each was theoretically a record of the red, blue, and green filters green rays reflected by the ribbon. The result was a color photograph—crude, but prophetic of the future.
Gravity conditions until the pressure drop becomes too high (25 kPa for gravity filters and green filters 70 kPa for pressure driven filters) or significant breakthrough of particulates occurs at the bottom of the bed. A typical unit operates for 24 h and green filters then backflushes with up to 2% of the filtrate produced. The backflushing operation tends to unfavourably grade different size sand green filterss and green filters it is not unusual for mixed-media beds such as anthracite/sand green filters to be used to reduce the problem. Although continuous operation can be achieved using conventional sand green filters filters in parallel, truly continuous depth filters exist where filtration proceeds with virtually no head loss.
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