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The illustration of a pantograph engraving machine in the essay contained in this work was taken (with permission) from the short-lived journal "The Dolphin" published by Macy's. The copyright on "The Dolphin" was renewed, and it remains in copyright. Therefore, any use of this image other than in a literal reprint of its use in Rollins' essay (as is the case here) may be a violation of Macy's copyright on it.
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