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I have never seen an explanation of the Eidophor that clearly explained how moving images were not smeared. The beam wrote on the oil, charging it and deforming the surface, and there was a slow rotation past a smoothing bar, but how was each picture erased when the next was written? Why didn't the image persist and rotate slowly out of view with the rotating oil? Was there some mechanism that discharged the oil quickly (within a 60th of a second)?
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