Summary

Various,  Notes and Queries, Number 219, January 7…

“ When a paper figure, bent over a straight line in it, has the two parts perfectly fitting on each other, the figure is symmetrical about that straight line, which may be called an axis of symmetry. Thus every diameter of a circle is an axis of symmetry: every regular oval has two axes of symmetry at right angles to each other: every regular polygon of an odd number of sides has an axis joining each corner to the middle of the opposite sides: every regular polygon of an even number of sides has axes joining opposite corners, and axes joining the middles of opposite sides. ”
Source: Gutenberg

Various,  Notes and Queries, Number 219, January 7…

“ First, suppose the angle made by the creases to be what the mathematicians call incommensurable with the whole revolution; that is, suppose that no repetition of the angle will produce an exact number of revolutions. Then the cutting will go on for ever, and the result will perpetually approach a circle. It is easily shown that no figure whatsoever, except a circle, has two axes of symmetry which make an angle incommensurable with the whole revolution. ”
Source: Gutenberg

Various,  Notes and Queries, Number 219, January 7…

“ As one hundred and sixty persons are noticed in the work, brevity of annotation is very desirable. It would require much research. The manuscript notes of sir William Musgrave would, however, be very serviceable—more so, I conceive, than the printed notes of M. Horace Walpole.
As the indications of a projected re-impression may be fallacious, I shall conclude with a word of advice to inexperienced collectors. Avoid the jolie édition printed at Paris by F. A. Didot, par ordre de monseigneur le comte d'Artois, in 1781. It is the very worst specimen of editorship.
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Source: Gutenberg

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