1. Sift together flour, cream of tartar, baking soda, and salt -set aside.
2. Cream butter and sugar. Add eggs one at a time; beat well after adding each.
3. Add dry ingredients. Refrigerate 1 hour.
4. Drop by teaspoonfuls onto lightly greased cookie sheet.
5. Press half a nut into center -sprinkle with cinnamon and sugar mixture.
6. Bake at 350 degrees for 12-15 minutes.