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Preheat oven to 350.
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Beat butter, 1 ½ cups sugar and eggs thoroughly in a large bowl with an electric mixer until light and fluffy. In a separate bowl combine flour, cream of tartar, baking soda and salt. Add flour mixture to butter mixture and still until just combined.
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Chill dough for about 10-15 minutes in the fridge. Meanwhile, mix 3 tablespoons sugar, and 3 teaspoons cinnamon in a small bowl.
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Roll dough into 1 inch balls and then roll in cinnamon mixture. Place on ungreased cookie sheet. Bake 10 – 13 minutes or until lightly golden.