In Chapter One of The Lord of the Flies, the boys have just crashed near an island. Ralph and Piggy are exploring the island. Interestingly, one of the first things Piggy says to Ralph is, "Where's the man with the megaphone?" Presumably, a man on the plane used a megaphone to be heard by all on board. Ralph spots a shell: the conch. Piggy adds that it could be used (like a megaphone) to call the others:
I seen one like that before. On someone's back wall. A conch he called it. He used to blow it and then his mum would come. It's ever so valuable--.
The conch becomes a symbol of power. The boys determine to vote for a chief. The choice is reduced to Ralph or Jack. One of the boys yells, "Let him be the chief with that trumpet-thing." Ralph becomes chief and although the conch is to be used to establish order and fairness (allowing everyone to speak), a power struggle is already in the making.