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This monitor presents visually the information recorded on magnetic tape without employing auxiliary equipment such as movable scanning heads, amplifiers, etc. The presentation is a variable-area display that indicates frequency and amplitude. The display remains stationary as long as the tape is motionless in the Magnescope, but movement of the tape is accompanied by corresponding movement of the display. Magnescope consists of a unique cathode-ray tube and its associated power supply. The cathode-ray tube is so constructed that the magnetic fields from the tape directly influence a beam of electrons which produces the variable-area display.
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Rowland L. Miller (1953) studied this question.
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