What part of the cathode ray tube (CRT) is tapered and lined with a conductive graphite coating?

The aquadag is the part of the cathode ray tube (CRT) that is tapered and lined with a conductive graphite coating. It serves an important function by providing a conductive surface that helps to collect and dissipate the electrons emitted by the electron gun. The graphite coating ensures that there is an even distribution of electric charge across the surface, enhancing the overall performance of the CRT. In addition, the aquadag helps to reduce the build-up of static electricity, which can interfere with the operation of the display.

The other components play different roles within the CRT. The faceplate is the front part of the CRT through which images are displayed, while the electron gun is responsible for generating the electrons that create the image. The deflection coils manipulate the path of the electrons to direct them toward specific locations on the faceplate to form images. Each of these components has its unique function, but it is the aquadag that provides the necessary conductive properties and structure that make the CRT function effectively.