In Lord of the Flies, how does Ralph decide to use the conch shell?

Althoughis
the one who first sees the conch, he has no idea it can be used as a trumpet. In chapter 1and
Ralph meet at the swimming lagoon, and Ralph spies and frees the conch, an 18-inch shell. Piggy
becomes very excited because he has seen a similar shell before. The person who had it on his
back wall blew into it and it "mooed like a cow." Piggy then realizes they could use
the conch to call the others. In typical ingratiating fashion, he attributes his brilliant idea
to Ralph, saying, "That was what you meant, didn't you? That's why you got the conch out of
the water?" Ralph doesn't deny it; he lets Piggy credit him for Piggy's
idea. Piggy then instructs Ralph on how to blow into the conch to make it
reverberate. It requires a certain lip and tongue action as well as a deep diaphragmatic exhale.
Piggy himself is unable to blow the conch because of his asthma. This foreshadows the
relationship of Piggy to Ralph, Piggy being the "brains behind the throne." Later, in
chapter 2, Ralph is declared chief because he has possession of the impressive conch, and he
creates the rule that at meetings one must have the conch in order to
speak.