Mix butter, sugar, and eggs with mixer in a large bowl. Add cream of tartar, baking soda, salt, and vanilla and continue mixing. Add flour and mix well. Put flour in refrigerator for about 20 minutes. In a smaller bowl mix the 3 tablespoons of sugar and the 3 teaspoons of cinnamon. Remove flour and roll into balls with your hands about the size of a walnut. Roll balls in cinnamon and sugar and place on an ungreased baking sheet. Cook in preheated 350 degree oven 10 - 12 minutes. Remove the cookies from the pan as soon as you take them from the oven. Makes about 3 dozen cookies