Assertion: cathode ray tube | /r/HasAspect | a beam intensity control
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Source sentences:
text: In a device of the character described, a cathode-ray tube having a beam intensity control and vertical and horizontal deflecting plates, a sawtooth wave generator comprising a vacuum tube having a variable resistor in its cathode circuit, a switch in parallel with said resistor, a vacuum tube having its control grid connected to the output of said sawtooth wave generator, a, relay operated by the output of said vacuum tube and adapted to connect a source of negative potential to said beam intensity control electrode of said cathode-ray tube.