Snickerdoodles

1/2 cup shortening

1 1/2 cups sugar

1/2 cup butter

2 eggs

2 1/2 cups flour

2 teaspoons cream of tartar

1 teaspoon baking soda

1/2 teaspoon salt

Heat oven to 400 degrees F.  Cream shortening, sugar, butter, and eggs.  Add all dry ingredients.  Mix.  Roll into balls (walnut size).  Roll in mixture of sugar and cinnamon.  Place on an ungreased cookie sheet.  Bake 8-10 minutes.