“Reader, whether man or woman,
Write my age in figures Roman (LXV.).
My first, divided by my second,
Will make my third, if rightly reckoned,
Ten times the whole, and then you’ll see
My university degree (D.C.L.).”
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52
This is the way to arrange a strip of paper 9 in. by 2 in. so that it has only one surface and one edge.
Gum the ends together with a half twist in the slip. If a continuous line is now drawn along the middle of the band it will traverse the whole length of the paper and finish at its starting point. Again, if a mark is made on the edge, and the finger or a pencil starting from this runs along the edge, it also will return to its starting point.
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53
To divide nine into two parts which shall be together equal to ten, write IX in bold Roman numerals on a sheet of paper, and fold this across the middle of the figures, thus—
IX — IVIɅ
This gives a six on one side of the fold and a four upon the other side.