General works on pantographs, without extensive references in them to pantograph engraving. (For that, see the Notebook On Pantograph Engraving)
From Schwamb & Merrill (1915)
An extract of pp. 120-124 of Schwamb, Peter and Allyne L. Merrill. Elements of Mechanism. Second Edition. (NY: John Wiley & Sons, 1915). This covers four-bar pantographs, four-bar pantographs with sliders, and Watt's "Parallel Motion."
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