Raising is ametalworking technique wherebysheet metal is formed over a solid object by repeated "courses" of hammering andannealing. Asheet metal worker is often required to raise, or bump, the work into form from the flat metal by means of a raising hammer and raising block. The raising block is made from substance giving resistance to the blows.[1]
A modern term issynclastic raising, the dominant curves of the object being forged are at right angles and move in the same direction; as in a bowl. This results in a surface possessingelliptic geometry.
Anticlastic raising, on the other hand, refers to shaping an object where the dominant axes move in opposite directions; a familiar example of this is apotato crisp. This results in a surface possessinghyperbolic geometry.
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