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To make a spiral:

1. Draw a 1" circle.
2. Click the Repeat button.
3. Set the diameter to 1.1"
4. Click the Repeat button.
5. Set the diameter to 1.2"
6. Continue as above up to the desired outer size.
7. Move the 1.0" circle away from the others.
8. Snap the North snap point of the 1.1" circle to the North snap point on the 1.0" circle.
9. Snap the East snap point of the 1.2" circle to the East snap point on the 1.1" circle.
10. Snap the South snap point of the 1.3" circle to the South snap point on the 1.2" circle.
11. Snap the West snap point of the 1.4" circle to the West snap point on the 1.3" circle.
12. Repeat in the above pattern for the remaining circles. Be careful - one mistake can create trouble below.
13. Select all.
14. Intersect.
15. File | Save
16. Delete the line segments that are not part of the spiral.
17. File | Save.

 Note: This method is not technically a true mathematical spiral.