In a separate bowl sift together flour, cream of tartar, baking soda and salt.
Stir into butter mixture until combined well.
Chill dough.
Roll dough into balls the size of walnuts.
Combine cinnamon and sugar into a small bowl. Roll balls into the mixture.
Bake on cookie sheet 2″ apart in a 400° oven for 10-12 minutes or until lightly browned. These cookies puff up at first but then flatten out with a crinkled top.
