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Double Writing

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Double Writing

pamphlet by William Petty, written and published 1648

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About Double Writing

A Declaration Concerning the newly invented Art of Double Writing was a pamphlet of 6 leaves, written by the English philosopher Sir William Petty (1623–1687) and first published in 1648. It contained information regarding his invention of the "Art of Double Writing", especially a claim for patent rights. It did not contain any information on what his invention exactly was.

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Facts from Wikidata (CC0). Image by William Petty via Wikimedia Commons (Public domain).