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--- cards:key_card [2013/11/22 21:36] – tylerwilson
+++ cards:key_card [2017/06/28 16:57] – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== Key Card ======
-This principle is mentioned by Girolamo Cardano in his //De subtilitate//, 1550, and has been a staple of card magic ever since.
+This principle is explained by Girolamo Cardano in his //De subtilitate// (1550, early in Book XV), and has been a staple of card magic ever since. See John M. Forrester's English translation of //De subtilitate//, Vol. 2, p. 754. Forrester mistranslates playing cards as pieces of paper, but the rest of his translation for this entry is clear enough.
   * [[http://www.conjuringarchive.com/tree.php?cat=536|Category in Denis Behr's "Conjuring Archive"]]
 {{tag>principle}}

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