Sift together the flour, baking powder and salt. Set aside.

To mix the cake add the flour mixture slowly to butter mixture in a large bowl, beating well (300 times).

Add half of the flour mixture, then half of the milk and the vanilla. Mix (50 times). Add the eggs, beating well after each addition.

Add the remaining flour mixture, then the rest of the milk. Mix until smooth (200 times).

Fill a greased and floured baking pan or 2 layer pans (no than half full).

Bake in a moderate (375°F) oven for 25 to 35 minutes until cake springs back when lightly touched near center.