Today, how to make a spiral, there are several ways to make spirals, this is just one. I learned this from a book by Albrecht Durer, The Painter's Manual, I believe.
Start with a straight line and mark off increments. This spiral works around two points which I've labeled A and B.
Set your compass to the distance between A and B with the stationary point on A. Arc the compass until you reach the line again.
Next set the stationary point of the compass on B and set your compass until it lines up where the spiral leaves off. Arc the line until it returns to the horizontal line.
With the compass back on point A set the compass again to where the spiral leaves off.
Repeat on B and until the spiral is as big as you want.
To finish the spiral you can continue on the the same point after crossing the horizontal line.
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