Cake - Sunshine Cake

1 1/4 cups sugar                                    1/4 tsp Cream of Tartar
1/3 cup boiling water                              1 cup cake flour
6 eggs                                                    1 tsp baking powder
1/3 tsp salt                                             1 tsp vanilla

Boil sugar and water, without stirring, until it spins a thread.  Add salt to the egg whites and beat until foamy, then add the Cream of Tartar and beat until stiff.  Add hot syrup gradually to the beaten whites, and beat five minutes.  Then add beaten yolks and beat two minutes.  Fold in the flour and baking powder, sifted together.  Add vanilla.  Bake in ungreased angel food pan 35 - 45 minutes at 350 degrees.