Into a bowl sift 2 cups flour with 2 tablespoons sugar, 4 teaspoons baking powder, and 1/2 teaspoons each of salt and cream of tartar. Cut in 1/2 cup butter until mixture resembles course meal. With a fork stir in 1/2 cup milk and form the mixture into a ball. Roll the dough out 1/4 inch thick on a floured board. Cover the blackberries with the dough and trim the edges. Cut a vent in the center of the dough and sprinkle the top generously with sugar.
Bake the cobbler in a hot oven (400 degrees) for 40 minutes, or until the crust is golden.
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