Behold the beauty of the sweet cathode-ray oscillograph!

A close-up of an old Allen B. DuMont Type 304 cathode-ray oscilloscope showing a green waveform on its screen, with visible knobs and labels for Y position, X position, intensity, and focus. The screen displays a jagged, irregular signal pattern resembling a heartbeat or a nervous spike. The device is labeled 'CATHODE-RAY OSCILLOGRAPH' and 'ALLEN B. DU MONT LABORATORIES, INC., PASSAIC, N.J., U.S.A.'

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