Sift together flour, cream of tartar, baking soda, and salt. Cream together margarine and sugar; add egg and mix well. Add dry ingredients and mix well.
Form dough into balls the size of walnuts. Make a mixture of 2 tablespoons sugar and 2 teaspoons cinnamon. Roll balls in mixture.
Place on ungreased cookie sheet. Bake 8 to 10 minutes at 350 degrees.