File:Rees's Cyclopaedia Polygraph.png
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:45, 2 February 2013 | 2,755 × 1,930 (1.54 MB) | Morgan Riley | {{Information |Description ={{en|1=Detail of a figure labelled "Hawkin's patent Polygraph". Engraving of John Hawkin's polygraph, used for producing duplicates of writing.}} |Source =Rees's ''Cyclopædia'', Plates ... |
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