The cathode-ray tube CRT is a vacuum tube that contains one or more electron guns and a phosphorescent screen and is used to display images. The images may represent electrical waveforms oscilloscope , pictures television , computer monitor , radar targets, or other phenomena. CRTs have also been used as memory devices , in which case the visible light emitted from the fluorescent material if any is not intended to have significant meaning to a visual observer though the visible pattern on the tube face may cryptically represent the stored data. In television sets and computer monitors, the entire front area of the tube is scanned repetitively and systematically in a fixed pattern called a raster. In color devices, an image is produced by controlling the intensity of each of the three electron beams , one for each additive primary color red, green, and blue with a video signal as a reference. A CRT is constructed from a glass envelope which is large, deep i. The interior of a CRT is evacuated to approximately 0.
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Where conductors entered a wiring device such as a lamp or switch, or were pulled into a wall, they were protected by flexible cloth insulating sleeving called loom. The first insulation was asphalt-saturated cotton cloth, then rubber became common. Wire splices in such installations were twisted together for good mechanical strength , then soldered and wrapped with rubber insulating tape and friction tape asphalt saturated cloth , or made inside metal junction boxes. Knob and tube wiring was eventually displaced from interior wiring systems because of the high cost of installation compared with use of power cables, which combined both power conductors of a circuit in one run and which later included grounding conductors.
There are much better options than just leaving it on the curb. Purchases you make through our links may earn us a commission. It'll be Earth Day this weekend, and—while you should be mindful of our big blue marble every day—it's still the perfect time to do a little homework and figure out how to dispose of your old TV properly. Whether you've recently replaced your old LED TV with a newer set or have just had a boxy CRT gathering dust in your basement for years, there are much better ways to recycle or pass on these complex devices that have brought you hours of comfort and joy than dumping them unceremoniously on the sidewalk. You monster. Here are some options to consider before or, hopefully, entirely in lieu of simply throwing your old TV in the trash or on the curb.