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Page "Cathode ray tube" ¶ 3
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cathode and ray
There are DVG commands for positioning the cathode ray, for drawing a line to a specified destination, calling a subroutine with further commands, and so on.
The first hints of glass cockpits emerged in the 1970s when flight-worthy cathode ray tubes ( CRT ) screens began to replace electromechanical displays, gauges and instruments.
* In a cathode ray tube, it is the positive terminal where electrons flow out of the device, i. e., where positive electric current flows in.
In electronic vacuum devices such as a cathode ray tube, the anode is the positively charged electron collector.
The word video in video game traditionally referred to a cathode ray tube ( CRT ) display device, but it now implies any type of display device that can produce two or three dimensional images.
High vacuum inside glass-walled cathode ray tubes permits electron beams to fly freely-without colliding into molecules of air.
Although modern cathode ray tubes used in televisions and computer displays have epoxy-bonded face-plates or other measures to prevent shattering of the envelope, CRTs must be handled carefully to avoid personal injury.
To take a different example, in the near-vacuum inside a cathode ray tube, the electrons travel in near-straight lines at about a tenth of the speed of light.
Using cathode ray tubes, Fred Williams would invent the Williams tube, which would be the first random access computer memory.
These are used in cathode ray tubes, found in televisions and computer monitors, and in electron microscopes.
Philipp Lenard also contributed a great deal to cathode ray theory, winning the Nobel prize for physics in 1905 for his research on cathode rays and their properties.
The technology of manipulating electron beams pioneered in these early tubes was applied practically in the design of vacuum tubes, particularly in the invention of the cathode ray tube by Ferdinand Braun in 1897. and is today employed in sophisticated devices such as electron microscopes, electron beam lithography, and particle accelerators.
* In vacuum tubes ( including cathode ray tubes ) it is the negative terminal where electrons flow in from the wiring and through the tube's near vacuum, constituting a positive current flowing out of the device.
Most radios and television sets prior to the 1970s used filament-heated-cathode electron tubes for signal selection and processing ; to this day, a hot cathode forms the source of the electron beam ( s ) in cathode ray tubes in many television sets and computer monitors.
The display device in modern monitors is typically a thin film transistor liquid crystal display ( TFT-LCD ) thin panel, while older monitors use a cathode ray tube ( CRT ) about as deep as the screen size.
Until the 21st century most used cathode ray tubes but they have largely been superseded by LCD monitors.
The first computer monitors used cathode ray tubes ( CRT ).
This method continued even when cathode ray tubes were manufactured as rounded rectangles ; it had the advantage of being a single number specifying the size, and was not confusing when the aspect ratio was universally 4: 3.
# REDIRECT cathode ray tube
Electrons are at the heart of cathode ray tubes, which have been used extensively as display devices in laboratory instruments, computer monitors and television sets.
In 1897, Karl Ferdinand Braun introduced the cathode ray tube as part of an oscilloscope, a crucial enabling technology for electronic television.
Vacuum tubes are still used in some specialist applications such as high power RF amplifiers, cathode ray tubes, specialist audio equipment and some microwave devices.

cathode and tube
The cathode consisted of a 1/4'' '' diameter thoriated tungsten rod attached to a water cooled copper tube.
Argon was also blown at low velocities ( mass flow rate Af ) through a tube coaxial with the cathode as an additional precaution against contamination of the arc by air.
In a tube, the anode is a charged positive plate that collects the electrons emitted by the cathode through electric attraction.
If an evacuated glass tube is equipped with two electrodes and a voltage is applied, the glass opposite of the negative electrode is observed to glow, due to electrons emitted from and travelling perpendicular to the cathode ( the electrode connected to the negative terminal of the voltage supply ).
Cathode rays are so named because they are emitted by the negative electrode, or cathode, in a vacuum tube.
To release electrons into the tube, they first must be detached from the atoms of the cathode.
In the early cold cathode vacuum tubes, called Crookes tubes, this was done by using a high electrical potential between the anode and the cathode to ionize the residual gas in the tube ; the ions were accelerated by the electric field and released electrons when they collided with the cathode.
Researchers noticed that objects placed in the tube in front of the cathode could cast a shadow on the glowing wall, and realized that something must be travelling in straight lines from the cathode.
After the electrons reach the anode, they travel through the anode wire to the power supply and back to the cathode, so cathode rays carry electric current through the tube.
The current in a beam of cathode rays through a tube can be controlled by passing it through a metal screen of wires ( a grid ) to which a small voltage is applied.
High speed beams of cathode rays can also be steered and manipulated by electric fields created by additional metal plates in the tube to which voltage is applied, or magnetic fields created by coils of wire ( electromagnets ).
In 1838, Michael Faraday passed a current through a rarefied air filled glass tube and noticed a strange light arc with its beginning at the cathode ( negative electrode ) and its end almost at the anode ( positive electrode ).
Crookes found that as he pumped more air out of the tubes, the Faraday dark space spread down the tube from the cathode toward the anode, until the tube was totally dark.

cathode and CRT
In 1897 he built the first cathode-ray tube ( CRT ) and cathode ray tube oscilloscope.
They are common in consumer devices such as video players, gaming devices, clocks, watches, calculators, and telephones, and have replaced cathode ray tube ( CRT ) displays in most applications.
This is an historical remnant from the early days of CRT television when CRT screens were manufactured on the bottoms of glass bottles, a direct extension of cathode ray tubes used in oscilloscopes.
It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray tube ( CRT ) and flat panel or projection displays using fixed-element arrays.
It originally referred to the raster scan of cathode ray tube ( CRT ) video monitors, which paints the image line by line by magnetically steering a focused electron beam.
Except for the main cathode ray tube ( CRT ), the company had completely switched from tubes to solid-state television sets by 1975.
One common application of the RGB color model is the display of colors on a cathode ray tube ( CRT ), liquid crystal display ( LCD ), plasma display, or organic light emitting diode ( OLED ) display such as a television, a computer ’ s monitor, or a large scale screen.
In classic cathode ray tube ( CRT ) devices, the brightness of a given point over the fluorescent screen due to the impact of accelerated electrons is not proportional to the voltages applied to the electron gun control grids, but to an expansive function of that voltage.
These tubes are a type of cathode ray tube, not to be confused with that of CRT displays.
Cathodoluminescence is most commonly experienced in everyday life as the light emission from the inner surface of the cathode ray tube in television sets and computer CRT monitors.
Later designs would use a rotating mirror-drum scanner to capture the image and a cathode ray tube ( CRT ) as a display device, but moving images were still not possible, due to the poor sensitivity of the selenium sensors.
* as a photoresist for cathode ray tubes ( CRT )
In December 2004, Toshiba quietly announced it would discontinue manufacturing traditional in-house cathode ray tube ( CRT ) televisions.
A common misconception is that gamma encoding was developed to compensate for the input – output characteristic of cathode ray tube ( CRT ) displays.
Apart from an Ethernet connection, the Alto's only common output device was a bi-level ( black and white ) cathode ray tube ( CRT ) display with a tilt-and-swivel base, mounted in " portrait " orientation rather than the more common " landscape " orientation.
In 1970, JVC marketed the Videosphere, a portable cathode ray tube ( CRT ) television inside a space-helmet-shaped casing with an alarm clock at the base.
An aperture grille ( tension mask ) is one of two major technologies used to manufacture color cathode ray tube ( CRT ) televisions and computer displays ; the other is shadow mask.
The shadow mask is one of two major technologies used to manufacture cathode ray tube ( CRT ) televisions and computer displays that produce color images.
Competing display technologies include cathode ray tube ( CRT ), organic light-emitting diode ( OLED ), AMLCD, Digital Light Processing DLP, SED-tv, LED display, field emission display ( FED ), and quantum dot display ( QLED ).

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