Henry Ernest Dudeney/Puzzles and Curious Problems/191 - Two Squares in One/Historical Note

Historical Note on Puzzles and Curious Problems by Henry Ernest Dudeney: $191$ - Two Squares in One

This dissection was discovered by Henry Perigal in about $1830$, and published by him in $1873$.

Martin Gardner reports on it in detail in his $1966$ collection Martin Gardner's New Mathematical Diversions from Scientific American

Sources

• 1966: Martin Gardner: Martin Gardner's New Mathematical Diversions from Scientific American: $5$: Paper Cutting
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Answers: $356$. Two Squares in One