Yep - back in the olden days of hot metal, the galleys were laid out on huge heavy black stone tables (had to carry the weight of all that lead). When a page was finished it was "locked up" with keys to tighten the form around the edge, then shoved off onto a steel-topped table called a turtle to go over to plate-making, where a blotter-type asbestos (I think) thing called a "flong" was put on top of it and subjected to huge pressure, giving an imprint of the page [which of course was backward]. The flong then was formed into a semi-circular shape, into which the plate was poured (hot metal again) and the metal plate went on steel rollers to the press where it was snapped in place by the really big guys who worked the pressroom. Editing on the stone meant working on the metal type, and required an ability to read upside down and backward, as the compositor had the right-side-up position on the page. And yes, I do remember the Kennedy assassination, but no, not the Lincoln one.
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