preheat oven to 375.

With wooden spoon cream butter, shortening, and sugar until smooth. add eggs and mix until well blended.

In a different bowl, sift flour cream of tartar, baking soda, and salt then resift.

Add dry ingredients to creamed mixture, stir until it is dough.

Shape into 1? dough balls. Roll in cinnamon-sugar mixture

space in even rows leaving about 2? apart on ungreased cookie sheet.

Bake 8 - 10 minutes. Remove pan, cool slightly. and carefully lift cookies onto cooling rack.