preheat oven to 350°
sift flour, baking soda and salt in a bowl
beat together butter and shortening. add 1 1/2 cup sugar and beat until light and fluffy, about 5 minutes
add eggs one at a time, beating well after adding each.
add flour mixture and blend until smooth
mix 3 tablespoons sugar and the cinnamon.
roll dough into 1 1/2 in balls, roll in sugar/cinnamon mixture and flatten onto a cookie sheet
bake about 11 minutes. cool