https://graphicarts.princeton.edu/2018/09/19/when-size-matters-the-eidograph/
When Size Matters: The Eidograph | Graphic Arts
Sep 18, 2018 - A quick and (relatively) simple way to enlarge or reduce an engraving, map, or chart in the 19th century was to use a Pantograph. See: But if you were a...
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