![]() ![]() If you draw a vacuum on the chamber and apply a high voltage to both ends, then a blueish purple glowing line forms. The simplest cathode ray tube is a sealed glass chamber that has electrodes at either end and a port to be able to draw a vacuum from. So many of you may be wondering now, how does a cathode ray tube work?Ī cathode ray tube consists of a ray going from the cathode to the anode, and it is made up of electrons. They are still used widely today as oscilloscope screens, but these cathode ray tubes as screens are a little bit more complicated than the simple cathode ray tube that we are going to be building in this instructable. These tubes have been used as television screens for all of the 20th century and for the early part of the 21st century. In fact, the first one was built in 1897 by scientist Ferdinand Braun. The video below compliments this instructable with a visual demonstration of this Cathode Ray Tube in action.ĬRT's have been around for a long time. ![]() This piece of test equipment that I will show you how to build can be used as an awesome scientific demonstration for any physics and chemistry class, or it can be used just as a way to confirm a long standing scientific principal. ![]() I'll explain how it proves this theory later in this instructable. This line not only looks cool, but it can be used to prove a scientific theory electrons are a subatomic unit with a negative charge. You can manipulate and bend this stream of electrons with a magnet. This is a stream of electrons that looks like a brilliant blue-purple line of plasma. When there is a vacuum drawn and a high voltage across the two electrodes, a cathode ray forms. A cathode ray tube, or CRT, is a glass tube with electrodes on either end. Luckily, there is a device that will let you. Electrons: they are all around us, but we cannot really see or interact with them. ![]()
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