The flutes described above are concave flutes. There is also the convex flute, shown in the bowls in Fig. 88. This type of flute is made by placing a piece of iron or hard wood, filed to the approximate shape of the flute wanted, in the vise and placing the vertical pencil line drawn on the side of the bowl exactly over the fluting block, and then beating the metal down alternately on each side of the block with the neck hammer, as shown in Fig. 87.