Step 1: Materials
-jig saw or bandsaw with a tiltable table.
-a plank of wood atleast a 1/2" thick
-a strong woodglue
Step 2: Measuring (ya sometimes you have to)
Begin by marking a center line down the middle of your plank of wood, then mark the middle of this line, this is where you will put your compass.
Then mark in even increments along this center line, these will make up the rings of your bowl. The distance between lines is up to you, If you make the distance the same the as the thickness of the plank then there will be no "steps" in your bowl. I chose to have small 1/8" steps in my bowl because I think it looks quite interesting. This made my lines a little less than 1" apart . I drew six lines, the biggest being about 14" from the center and the smallest being about 8".
Now take your compass and seat it securely into the center mark you want it to stay here for all the circles you draw so they are all perfectly concentric. Then use it to trace out circles that meet all the lines you just drew.