DRAWING A SPIRAL.
(
Patchwork Puzzles)
If you hold the page horizontally and give it a quick rotary motion
while looking at the centre of the spiral, it will appear to revolve.
Perhaps a good many readers are acquainted with this little optical
illusion. But the puzzle is to show how I was able to draw this spiral
with so much exactitude without using anything but a pair of compasses
and the sheet of paper on which the diagram was made. How would you
proceed in such circumstances?
Read Answer
Next:
HOW TO DRAW AN OVAL.
Previous:
THE GARDEN PUZZLE.
