Preheat oven to 375º. Sift Swans Down® Cake Flour, then lightly spoon into measuring cup for 1 ¼ cups. Add ½ cup sugar, and sift four times. In a separate, very large bowl, combine egg whites, cream of tartar, salt, and flavorings. Beat at high speed of electric mixer until moist soft peaks form. Add balance of sugar in 4 additions, beating until blended after each addition. Sift in flour mixture in 4 additions, folding in with large spoon; turn bowl often. Bake: Pour into ungreased 10 inch tube pan. Bake at 375º, 35 to 40 minutes. Cool cake upside down in its pan, on a cake rack (or placed on an upside-down funnel or heatproof bottle) for about 1 hour or until comfortable for handling.
Note: ***Use a very large bowl.