Make a fold in the
paper, as shown by the dotted
line in the illustration.
Then, taking any two points, as A and B,
describe semicircles on the line alternately from the centres B and A,
being careful to make the ends join, and the thing is done.
this is not a true
spiral, but the puzzle was to
produce the particular
spiral that was shown, and
that was drawn in this simple manner.