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6.AS.1.a. GREEK CROSS TO A SQUARE
Note that a proper Greek cross is formed from five equal squares.
Lucas. RM2. 1883. Loc. cit. in 6.AS.1. Uses 20 triangles.

Lemon. 1890. The Maltese cross squared, no. 369, pp. 51 & 111. Cut a Maltese cross (really a Greek cross) by two cuts into four pieces that make a square.

Hoffmann. 1893. Chap. III, no. 13: The Greek cross puzzle, pp. 94 & 126 = Hoffmann Hordern, pp. 82 & 84. Has four pieces made by two cuts.

Loyd. Tit Bits 31 (10, 17 & 31 Oct 1896) 25, 39 & 75. = Cyclopedia, 1914, p. 14. Four pieces as in Hoffmann.

Loyd. Problem 23: A new "square and cross" puzzle. Tit Bits 31 (13 Mar 1897) 437 & 32 (3 Apr 1897) 3. = Cyclopedia, 1914, pp. 58, 270 & 376. Four congruent pieces.

Loyd. Problem 27: The swastika problem. Tit Bits 32 (3 & 24 Apr 1897) 3 & 59. = Cyclopedia, 1914, p. 58. Quadrisect square to make two equal Greek crosses.

Loyd. Problem 30: The Easter problem. Tit Bits 32 (24 Apr & 15 May 1897) 59 & 117. Dissect square into five pieces to make two unequal Greek crosses.

Dudeney. Problem 56: Two new cross puzzles. Tit Bits 33 (23 Oct & 13 Nov 1897) 59 & 119. Dissect a half square (formed by cutting a square either vertically or diagonally) to a Greek cross. Solutions in 3 and 4 pieces. [The first case = Loyd, Cyclopedia, 1914, Easter 1903, pp. 46 & 345.]

Benson. 1904. The Greek cross puzzle, p. 197. = Hoffmann, p. 94.

Dudeney. Cutting-out paper puzzles. Cassell's Magazine ?? (Dec 1909) 187-191 & 233-235.

States that the dissection with four pieces in two cuts is relatively 'recent'. c= AM, 1917, p. 29, which dates this to 'the middle of the nineteenth century'.

Fold a Greek cross so that one cut gives four congruent pieces which form a square. = AM, 1917, prob. 145, pp. 35 & 169.

M. Adams. Indoor Games. 1912. The Greek cross, p. 349 with figs. on p. 347.