Came here to say “video or it didn’t happen”. Was not disappointed. Terrific explainer, thanks for posting. It seemed odd not to use a rotating cylinder rather

Came here to say “video or it didn’t happen”. Was not disappointed. Terrific explainer, thanks for posting. It seemed odd not to use a rotating cylinder rather than a disc, for parallel rather than curved scan lines. The cylinder could have become a tape, which would have reduced the size of the apparatus, although not as sturdy. /end steampunk mad inventor daydream