Preheat oven to 375°F (190°C).
In a mixing bowl, cream together butter and 1.5 cups of sugar until light and fluffy.
Beat in eggs one at a time.
In a separate bowl, combine flour, cream of tartar, baking soda, and salt.
Gradually add dry ingredients to the butter mixture, mixing until just combined.
In a small bowl, mix 2 tablespoon of sugar and 2 teaspoon of ground cinnamon.
Shape dough into 1-inch balls and roll in cinnamon-sugar mixture.
Place 2 inches apart on ungreased baking sheets.
Bake for 8-10 minutes, or until edges are set and lightly golden.
Cool on wire racks.