in Strand Magazine vol. 68 (July 1924), pp. 97 and 214.
Henry Dudeney:
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Henry Ernest Dudeney was an English author and mathematician who specialised in logic puzzles and mathematical games. He is known as one of the country's foremost creators of mathematical puzzles. Wikipedia
in Strand Magazine vol. 68 (July 1924), pp. 97 and 214.