filter layer
41slow sand filter — A bed of sand through which water slowly flows; the gelatinous microbial layer on the sand grain surface removes waterborne microorganisms, particularly Giardia, by adhesion to the gel. This type of filter is used in some water purification… …
42trick|ling filter — «TRIHK lihng», a tank filled with crushed rocks on which sewage is distributed so that it comes in contact with bacteria that change the organic material in the sewage to less harmful substances as it trickles down through the layer of rocks …
43photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
44Color photography — Color film redirects here. For the motion picture equivalent, see Color motion picture film. A circa 1850 Hillotype photograph of a colored engraving. Long believed to be a complete fraud, recent testing found that Levi Hill s process did… …
45C-41 process — C 41 is a chromogenic color print film developing process. C 41, also known as CN 16 by Fuji, CNK 4 by Konica, and AP 70 by AGFA, is the most popular film process in use, with most photofinishing labs devoting at least one machine to this… …
46Xbloc — An Xbloc is an interlocking concrete block or armour unit designed to protect shores, harbour walls, seawalls, breakwaters and other coastal structures from the direct impact of incoming waves. The Xbloc model has been designed and developed by… …
47Photography — is the art, science and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor or chemically by means of a light sensitive material such as photographic… …
48K-14 process — K 14 is the developing process for Kodak s Kodachrome transparency film. The process differs significantly from the other color transparency processes in use today in terms of both complexity and processing steps. Kodachrome film does not have… …
49Polavision, Polachrome and Polapan — Polavision was an instant movie camera system launched by Polaroid in 1977.Unlike other motion picture film stock of the time, Polavision generated color using an additive process. It consisted of (essentially) a black and white film base and… …
50North Simcoe Landfill (Site 41) — The electoral riding of Simcoe North in southern Ontario. North Simcoe Landfill (Site 41) was a planned 20.7 hectare (50 acre) landfill site for municipal waste in northern Simcoe County, 40 kilometres northwest of Barrie, Ontario. The site would …
