![]() “Cathode Ray Television,” reprinted by the Antique Valve Museum in all its Web 1.0 glory, originally appeared in the edition of Popular Wireless magazine, and was authored by one K D Rogers of that august publication’s Research Department. But building your own television receiver in 1933 was probably pushing the envelope for even the earliest of adopters. When something gee-whiz comes along, it’s folks like us who try it out, even if that means climbing steep learning curves or putting together odd bits of technology rather than waiting for the slicker products that will come out if the new thing takes off. ![]() He’s no stranger to such public displays, of course - you might remember his interactive public fountain, or this cyborg baby in a window.Ĭontinue reading “Fifteen Flat CRTs And A Bunch Of Magnets Make For Interactive Fun” → Posted in Art, classic hacks Tagged cathode ray tube, crt, deflection, exhibit, magnet, museum, neodymiumīy our very nature, hackers tend to get on the bandwagon of new technology pretty quickly. put a lot of thought into both the interactivity of the exhibit, plus the practical realities of a public installation, which will likely take quite a beating. Users then get to use a selection of tethered neodymium magnets to warp and distort their faces on the screen. ![]() In use, each monitor displays video from a camera mounted to the module. The modules were then mounted into a console that looks a little like an 80s synthesizer. After locating fifteen of these things - probably the biggest hack here - they were stripped out of their cases and mounted into custom modules. The CRTs that chose for the exhibit were the flat-ish monochrome tubes that were used in video doorbell systems in the late 2000s, like the one used for his CRT Game Boy. To bring this experience to a generation who may never have seen a CRT display in their lives, developed “Deflektron”, an interactive display for a science museum in Switzerland. Watching the picture on the family TV warp and twist like a funhouse mirror was good clean fun, or at least it was right up to the point where you permanently damaged a color CRT by warping the shadow mask with a particularly powerful speaker magnet - ask us how we know. The CRT was the main type of television screen until the liquid crystal display became popular in the early 2000s.If you were a curious child growing up when TVs were universally equipped with cathode ray tubes, chances are good that you discovered the effect a magnet can have on a beam of electrons. Later, along with other inventions and improvements, it was used for the first modern electronic television by Philo T. The cathode ray tube was invented in 1897, and used as an oscilloscope (a machine to show waves). For a large television, this vacuum tube can be quite heavy. Because there is a vacuum inside the tube (which has to be strong enough to hold out the air), and the tube must be glass for the phosphor to be visible, the tube must be made of thick glass. Changing this picture 30 times every second will make it look like the picture is moving. By carefully controlling which bits of phosphor light up, a bright picture can be made on the front of the vacuum tube. The electrons can be aimed by creating a magnetic field. ![]() The electrons make the phosphor light up. The electrons hit the front of the tube, where a phosphor screen is. To better control the direction of the ray, the air is taken out of the tube, making a vacuum. This is used to pull the electrons toward the front of the glass tube, so the electrons shoot out in one direction, making a cathode ray. Also inside the glass tube is an anode that attracts electrons. The cathode is an electrode (a metal that can send out electrons when heated). It was used in almost all computer monitors and televisions until LCD and plasma screens started being used. It was the most common type of display for many years. The cathode ray tube or CRT was invented by Karl Ferdinand Braun. Cathode ray tube using electromagnetic focus and deflection (parts shown are not to scale)
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