Beat the egg whites with the cream of tartar, vanilla and salt until stiff peaks
form.
Gradually sift 1 cup of the sugar into the beaten whites and beat to incorporate.
Sift remaining sugar with all the flour and gently fold it into the whites.
Gently
turn the batter into an ungreased 10-inch tube pan and bake at 350 degrees F for
45 to 50 minutes. (When done, the cake should spring back at the touch of a finger.)