Preheat oven to 400°F

Cream together butter, shortening, 1 1/2 cups sugar, the eggs and the vanilla.

Blend in the flour, cream of tartar, soda and salt.

Shape dough by rounded spoonfuls into balls.
Mix the 2 tablespoons sugar and the cinnamon. Roll balls of dough in mixture.

Place 2 inches apart on ungreased baking sheets. Bake 8 to 10 minutes, or until set but not too hard.

Remove immediately from baking sheets.