Macaroni is a product of wheat prepared from a hard, clean, glutenous grain. The grain is ground into a meal called semolina, from which the bran is excluded. This is made into a tasty dough by mixing with hot water in the proportion of two thirds semolina to one third water. The dough after being thoroughly mixed is put into a shallow vat and kneaded and rolled by machinery. When well rolled, it is made to assume varying shapes by being forced by a powerful plunger through the perforated head of strong steel or iron cylinders arranged above a fire, so that the dough is partially baked as it issues from the holes.