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I have only been able to trace one complete example of Brunel's patent Polygraph:

"MARC ISAMBARD BRUNEL'S PATENTED POLYGRAPHIC PORTABLE WRITING AND DRAWING DESK, English, c. 1805, signed in three places by the maker I.H. Farthing of Cornhill, London, and likewise serial numbered "167.""

http://www.etesseract.com/Drafting/Drafting.html  

Image courtesy Tesseract -- Early Scientific Instruments

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