Mother's Fine Sugar Cookies -Grandma Great

1 cup butter or margarine
1/2 cup powdered sugar
3/4 cup granulated sugar (divided)
1/8 tsp. salt
1 egg
1 tsp. vanilla
2 1/2 cups flour
1/2 tsp. baking soda
1/2 tsp. cream of tartar
1/2 tsp. nutmeg

In a large bowl, beat butter, powdered sugar, 1/2 cup granulated sugar, and salt until well blended. Add egg and vanilla, beat until light and fluffy. stir together flour, soda, and cream of tartar. Stir into creamed mixture. Chill about 2 hours, or until dough is easy to handle. Shape into 3/4 inch balls and place 2 inches apart on a baking sheet. Flatten with the bottom of a glass, buttered and dipped in a mixture of the remaining sugar and nutmeg. Bake at 350° for 10-12 minutes.