Preheat your oven to 350°F (175°C).
Sift together the cake flour and 1/2 cup of sugar. Set aside.
In a large bowl, beat egg whites until foamy.
Add cream of tartar and salt; continue beating until soft peaks form.
Gradually add remaining sugar, beating until stiff peaks form.
Gently fold in the flour mixture in batches.
Add vanilla and almond extract, folding carefully to combine.
Pour batter into an ungreased tube pan, smoothing the top.
Bake for about 35-40 minutes or until golden and springy to touch.
Invert the pan and let the cake cool completely before removing.