Preheat oven to 350°F. Butter and flour a bundt pan.
Sift Swans Down Cake Flour and measure 3 cups.
Cream butter and sugar in a large bowl until fluffy.
Stir together flour mixture (flour, baking powder, salt).
Add eggs one at a time, beating after each.
Alternate adding flour mixture and milk, blending after each.
Pour into pan and smooth the top.
Bake for 45-50 minutes (bundt) or 20-25 minutes (cake layers).
Cool for 10 minutes, then transfer to a rack.