Banana Meringue Pie

1/2 cup plus 6 tablespoons granulated sugar
6 tablespoons all-purpose flour
1/4 teaspoon salt
2 1/2 cups milk
3 eggs, separated
1 tablespoon butter or margarine
1/2 teaspoon vanilla extract
2 or 3 ripe bananas
Baked 9-inch pie shell
Dash of salt
1/4 teaspoon cream of tartar

Mix 1/2 cup sugar, the flour and salt in top part of double boiler. Add milk and cook over boiling water until thickened, stirring constantly. Cover and cook 10 minutes longer, stirring occasionally. Beat egg yolks. Add a small amount of milk mixture slowly to yolks; return to double boiler and cook 2 minutes, stirring. Remove from heat; add butter and vanilla extract. Cool. Slice bananas into shell; pour cooked mixture over them at once. Add salt and cream of tartar to egg whites; beat until stiff. Gradually add 6 tablespoons sugar, continuing to beat until very stiff. Pile lightly on pie; spread to edge. Bake at 325 degrees F for about 18 minutes.