Article date: Aug 1960
Article title: An imaginary dialogue on "mathemagic": tricks based on mathematical principles
Mathematical Games column? Y
Book: 3. New Mathematical Diversions from Scientific American
Chapter: 9. Victor Eigen: Mathemagician
This data confirmed? yes
Notes
Peter Rowlett (27 August 2022):
Peter Rowlett initial guess (Very uncertain)
Peter Rowlett (28 October 2023):
I have seen this chapter and column side-by-side and they match.