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CurrencyDen1
John Holt Ibbetson was one of the forerunners of banknote security printing and his Geometric Chuck Machine can be seen in the Science Museum, London.

John Holt Ibbetson posted Specimen Proofs from his publication 'A Practical View of an Invention for the Better Protecting Banknotes Against Forgery' of 1820. There are 10 specimens in this collection, although the publication had 17 and 68 pages of Print. All of the specimens where placed loosely into the publication.
8 of the specimens are on handmade paper varying in weight and 2 are on Indian type watermarked paper.
John_Holt_Ibbetson.jpg   
  These were sold by Wayside Mews Collectables.  The view the other 5 images posted, see sale here:
https://www.antiques-atlas.com/antique/john_holt_ibbetson_security_printing_specimens/as167a1125



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Steve in Tampa
Interesting read, thanks.

Is a Geometric Chuck Machine an early version of a Spirograph ?
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CurrencyDen1
A machine able to make perfect concentric circles, then move to precisely overlap the first one...the answer is yes! 
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Berny
You can read the pdf file for the whole book here;

https://www.google.com/books/edition/A_practical_view_of_an_invention_for_the/-DcKAQAAMAAJ?hl=en&gbpv=0
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GregAlex
Interesting - I always thought Perkins invented the geometric lathe.
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