How did the bell get its shape?

Question

How did the bell get its shape?

Answer 1

The shape was chosen for its resonance when struck.  Propably originally an earthenware bowl which was hit with a stone or piece of wood to sound a warning.

In iron age times, the shape was still regarded as the best for creating a sound and casts were made for iron to be shaped, eventually with a clapper hanging inside it.

Answer 2

It was casted that way.  :)

Answer 3

Don't know!!