After raising a form like C, [Plate 34], it may be desired to increase the diameter a little at o-o, where an anvil cannot be used; or, if the form is satisfactory it may be necessary to raise certain parts of it to carry out the decoration called for by the design. This is done by the use of the snarling-iron, made as illustrated at [Figure 26], which shows the general outline only, as the ends vary in form according to the work they are to do. One arm of the iron is held in the vise as at [Figure 27]. The form is then placed over the end and held with the left hand while, with a hammer in the right hand, the iron is struck quite near the end in the vise which causes the other end to rebound. This serves the same purpose as a direct blow from a hammer, except that it works much more slowly.
Figure 26.
Figure 27.