Coolest video I've seen today: an electronic scanner-paint plotter from 1970!
@theodric Nice! I wonder how they detected when the brush needed refilling.
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I would guess it was timed, and the brush was always dipped after a long enough travel without painting (the only time in the video when a stroke doesn't start with dipping are those weird looking very short interrupted strokes, where interruptions do not involve redipping).
