#electron_gun  the electrode that is the source of electrons in a cathode-ray tube or electron microscope; consists of a cathode that emits a stream of electrons and the electrostatic or electromagnetic apparatus that focuses it
  supertype:  electrode  a conductor used to make electrical contact with some part of a circuit
  part of:  cathode-ray_tube__cathoderaytube__CRT  a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen
     part of:  electronic_computer__computer__computing_machine__computingmachine__computing_device__computingdevice__data_processor__information_processing_system  a machine for performing calculations automatically
        part of:  platform.computer_system  the combination of a particular computer and a particular operating system
     part of:  cathode-ray_oscilloscope__cathoderayoscilloscope__oscilloscope__scope__CRO  electronic equipment that provides visual images of varying electrical quantities
        part of:  cardiac_monitor__cardiacmonitor__heart_monitor__heartmonitor  a piece of electronic equipment for continual observation of the function of the heart
        part of:  monitoring_device__monitor  display consisting of a device that takes signals from a computer and displays them on a CRT screen
           part of:  electronic_computer__computer__computing_machine__computingmachine__computing_device__computingdevice__data_processor__information_processing_system  a machine for performing calculations automatically
        part of:  microwave_radar__microwaveradar__radar__radio_detection_and_ranging__radiodetectionandranging__radiolocation  measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
     part of:  television_system__television  a telecommunication system that transmits images of objects (stationary or moving) between distant points
  part of:  electron_microscope  a microscope that is similar in purpose to a light microscope but achieves much greater resolving power by using a parallel beam of electrons to illuminate the object instead of a beam of light

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