MASTER MIX (like Bisquick)

9 c. sifted all-purpose flour  1/3 c. baking powder  1 Tbsp. salt  2 tsp. cream of tartar  4 Tbsp. sugar  1 c. nonfat dry milk  2 c. shortening which does not require refrigeration    Sift together 3 times the flour, baking powder, salt, cream of tartar,  sugar and dry milk. Cut in shortening with pastry blender or 2 knives  until mixture looks like coarse corn meal. Store in covered container  at room temperature.  Makes 13 cups mix.    Note: To measure the Master Mix, pile it lightly into cup and level   off with spatula.