Lady Baltimore Cake
Source: The Household Searchlight

1 cup butter or butter substitute
1/4 cup sweetened condensed milk
3/4 cup water
4 tsp baking powder
1 tsp vanilla
3 1/2 cups cake flour
1/2 tsp salt
1 7/8 cups sugar
6 egg whites
1 tsp orange flavoring

Cream butter. Add gradually sugar, which has been sifted before measuring. Beat until smooth and creamy. Sift flour, measure, and sift with baking powder and salt. Combine milk and water. Add alternately with dry ingredients to first mixture. Add flavorings. Fold in stiffly beaten egg whites. Pour into well-oiled layer cake pans. Bake in moderate oven (375 F) about 35 minutes. Use fruit and nut filling between layers and a boiled icing for top and sides.