Cathode Ray Tube

The name cathode ray tube is actually archaic, it should be called an electron beam tube. The latter never became generally accepted.

The electrons pass from the Katode _K and through the grid _g . Actually there is only one hole in the grid . The electrons are accelerated by the anode_Ha . The voltage to the focusing anode_F changes the image definition. The post acceleration anode_A brings the electrons to a higher speed. They go through two deflection plates for vertical deflection and two for horizontal deflection. Then they hit the screen. The coating on the inside of the tube lights up depending upon it's composition: green, yellow or blue. The graphite lining catches electrons bouncing around. In modern electronics Cathode Ray Oscilloscopes are just as important measuring instruments, as volt,amp and ohm meters.