A scrap-book of elementary mathematics; notes, recreations, essays (1908)
White, William Frank, 1871- · Chicago, The Open Court Pub. Co · leaf 185
EMENTARY MATHEMATICS. his signature would have been written in a single course of the pen. Fig. 42, formed of two crescents, is "the so-called sign manual of Mohammed, said to have been orig- inally traced in the sand by the point of his scimetar without taking the scimetar off the ground or re-… … Fig. 44. crescents be omitted, a figure (Fig. 43) is left which can not be traced unicursally.' There are then four points of odd order; hence two strokes are requisite to describe the figure. Labyrinths such as the very simple one shown in Fig. 44 (published in 1706 by London and Wise) are…
Mathematical recreations
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