The boy's holyday book, for all seasons : containing complete instructions for angling, swimming, conjuring, the making of fireworks, cricket, archery, gymnastics, and the various games for boys : numerous scientific experiments & amusements : elucidations of photography, electrotype, and daguerreotype : arithmetical pastimes : the language of the deaf & dumb, &c. : with numerous engravings (1840)
London. : G.H. Davidson · leaf 156
140 arithmetical pastimes. A Natural Square. A Magical Square. … Any five of these sums taken in a right line make 65. Yoa will observe that five numbers in the diagonals A to D, and B to C, of the magical square, answer to the ranks E to F, and G to H, in ihe natural square, and that 13 is the central number of both squares. To form a magical square, first…
Boys · Amusements
Internet Archive · Harold B. Lee Library · Public domain (published before 1931). Free to use for anything.
