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A cathode ray tube

A cathode ray tube or CRT is a device that produces cathode rays in a vacuum tube and accelerates them through a magnetic and electric field to strike on a fluorescent screen to form images. The eminent physicist, Johann Hittorf discovered cathode rays in in Crookes tubes. Crookes tubes are partially vacuum tubes having two electrodes kept at a high potential difference to discharge cathode rays, from the negatively charged electrode, cathode. Arthur Schuster and William Crooks proved that cathode rays are deflected by electric and magnetic fields, respectively. In the year , the English physicist J.


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Performance tests and quality control of cathode ray tube displays


Safe Kids Worldwide recommends placing large, old-fashioned cathode-ray tube TVs on low, stable pieces of furniture or removing them from the house completely. An x-ray two hours later confirms my hunch: my tibia the big bone behind the shin is snapped clean in two.

I have been a Ray Harryhausen fan since I was six or seven years old. Drone: the largest tube of a bag-pipe, giving forth a dull heavy tone. Should the vapor not condense well, the test-tube may be immersed in a glass of cold water.

A ray of Consciousness is passed over that impression and you re-read it, you re-awaken the record. For comparison, the gas may be passed through a test-tube containing an equal amount of distilled water. At once cover the mouth of the tube with a filter-paper cap moistened with saturated aqueous solution of silver nitrate A device that can produce an image on a screen with electrical impulses.

New Word List Word List. Save This Word! See synonyms for cathode-ray tube on Thesaurus. The terminus of the beam is visible as a spot or line of luminescence caused by its impinging on a sensitized screen at one end of the tube. Cathode-ray tubes were formerly commonly used to study the shapes of electric waves, to reproduce images in television receivers, to display alphanumeric and graphical information on computer monitors, as an indicator in radar sets, etc.

Abbreviation : CRT. We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms. Origin of cathode-ray tube First recorded in — Words nearby cathode-ray tube cathode , cathode dark space , cathode glow , cathode ray , cathode rays , cathode-ray tube , cathodic , cathodic protection , cathodoluminescence , cat hole , catholic.

Words related to cathode-ray tube kinescope. How to use cathode-ray tube in a sentence Safe Kids Worldwide recommends placing large, old-fashioned cathode-ray tube TVs on low, stable pieces of furniture or removing them from the house completely.

Gulliver's Travels Jonathan Swift. The device, with appropriate deflection equipment, is used in television receivers, visual display units, oscilloscopes, etc Abbreviation: CRT.

A sealed tube in which electrons are emitted by a heated, negatively charged element the cathode , and travel in a beam toward a positively charged plate the anode. Depending on the properties of the plate and the speed of the electrons, cathode-ray tubes can generate x-rays, visible light, and other frequencies of electromagnetic radiation. They are central to most television screens, in which the electron beams form images on a phosphor-coated screen.

A Closer Look Cathode-ray tubes CRTs , also called electron-ray tubes, provide the visual display in such devices as conventional television sets, computer monitors, hospital heart monitors, and laboratory oscilloscopes.

CRTs are generally made of funnel-shaped glass vacuum tubes. At the larger end of the tube is a phosphor-coated screen, and at the other end is an electron gun. The gun consists of a heated cathode, or negative electrode, which emits electrons, and a control grid, which controls the intensity of the beam of electrons to vary the brightness of the image.

The gun directs the electron beam, or cathode ray , toward the screen, where a positively charged anode attracts the electrons. Outside the tube, coils creating a magnetic field or plates creating an electric field both focus and steer the beam. Wherever the beam strikes the screen, it causes the phosphors to glow. Shapes and images can be formed by manipulating the beam so that its focal point on the screen sweeps across it in various paths and with different brightness.

In most CRTs, the beam follows a zigzag path that covers the entire screen many times per second. Color screens use three separate beams that strike three individually colored phosphor cells having the three primary colors red, blue, and green that are very close together.

The color combinations appear to the eye at a distance to the screen as one point of a single color. All rights reserved. Increasingly, flat-panel displays are replacing CRTs.


Cathode ray tube

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cathode ray tube meaning, definition, what is cathode ray tube: a piece of equipment used in televisions: Learn more.

Cathode Ray Tube (CRT):


Cathode ray tube CRT monitors are electronic equipment mainly made of glass, polymers and metals. These devices became obsolete because of emerging technologies such as LCD, LED and plasma; thus generating a huge stockpile of e-waste worldwide. The standard NBR procedure was performed for 7 different monitors. The results show all samples are hazardous according to local environmental law NBR due to lead leaching. Moreover, six optimum thermal lead removal procedures were performed and the NBR procedure was repeated. Three out of six parameters were capable of satisfactorily removing the lead and turning the post-procedure waste lead-leaching safe. Electrical and Electronic Equipment EEE is - but is not limited to - equipment which is dependent on electric currents or electromagnetic fields in order to work properly. WEEE contains a significant number of precious metals, many of which are being recovered through different studies: examples include the recovery of copper Kasper et al.

Cathode Ray Tube (CRT)

a cathode ray tube

The Columbia Electronic Encyclopedia, 6th ed. All rights reserved. See more Encyclopedia articles on: Electrical Engineering. Enter your search terms:.

The last mile problem, in the context of telecommunications, refers to a gap between a broadband internet service provider's infrastructure and a customer's home or workplace. Last mile connectivity is one of the biggest costs many businesses and home owners face when trying to access

Television History and the Cathode Ray Tube


A cathode ray tube contains a positively charged region the anode and a negatively charged region the cathode. The cathode is located at the back of the tube. As electrons exit the cathode, they are attracted to the anode. The electrons are also focused electronically into a tight beam, which passes into the central area of the television screen. The central region is almost free of air, so that there are few air molecules to deflect the electrons from their path.

1946: Williams demonstrates CRT storage

Include Synonyms Include Dead terms. Peer reviewed Direct link. In , in the midst of the debate between English and continental scientists about the nature of cathode rays, William Crookes conducted an experiment in which a small mill or "paddle wheel" was pushed along tracks inside a cathode ray tube CRT similar to that shown in Fig. Crookes attributed the motion of the wheel to momentum transfer from the cathode rays electrons to the wheel, and interpreted the experiment as providing evidence that cathode rays were particles. The misconception was not laid to rest, however, and despite an effort in to draw attention to Thomson's original work and so remove the error from textbooks, the notion that a Crookes paddle wheel CRT demonstrates that electrons carry momentum continues to be taught in high school physics courses and wheel. We then measured the actual acceleration of the wheel in the CRT by video analysis of its motion and determined the moment of inertia of the wheel along with its mass and dimensions.

A new technique has been developed which creates holograms artifically, using a cathode-ray tube (CRT). Essentially, the method computes, from theory.

Understanding of Cathode Ray Tube – CRT

Discovering how cathode rays behave in a magnetic field was a big step forward for scientists trying to understand the mysterious phenomenon. Cathode rays were a great mystery throughout the latter half of the nineteenth century. Thomson are just a small sample of the many great minds who contributed to the modern understanding of cathode rays.

Cathode Ray Tube for Television

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Definition and synonyms of cathode ray tube from the online English dictionary from Macmillan Education. This is the British English definition of cathode ray tube. View American English definition of cathode ray tube. Change your default dictionary to American English. View the pronunciation for cathode ray tube. Open Dictionary.

This paper will analyze the fundamental construction of the CRT, its basic functioning as well as how CRTs age over time, outlining their specific signs of deterioration and malfunction.

cathode-ray tube

Patrick, Norman W. Last reviewed: January An electron tube in which a beam of electrons can be focused to a small cross section and varied in position and intensity on a display surface. In common usage, the term cathode-ray tube CRT is usually reserved for devices in which the display surface is cathodoluminescent under electron bombardment, and the output information is presented in the form of a pattern of light. The character of this pattern is related to, and controlled by, one or more electrical signals applied to the cathode-ray tube as input information.

What is a Cathode Ray Tube?

The development of electronic television systems was based on the development of the cathode ray tube CRT. A cathode ray tube aka picture tube was found in all electronic television sets up until the invention of the less bulky LCD screens. Besides television sets, cathode ray tubes are used in computer monitors, automated teller machines, video game machines, video cameras, oscilloscopes and radar displays.




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