So Jonas proceeded to take off the leather from one of the sides of the bellows. There was a hole in one of the sides, but no hole in the other. Nathan had often noticed the hole, but he did not know what it was for.
"What is the hole for?" said Nathan.
"That is to let the air in," said Jonas.
"What do they want the air to come in for?" said Nathan.
"To make wind of," said Jonas.
"Do they make wind out of air?" said Nathan.
"Yes," said Jonas, "they get the bellows full of air, and then blow it out through the nose, and that makes wind."
"Wind is air, put in motion," said Rollo. "I read it in a book."
By this time, Jonas had taken off the leather so far that Nathan could see into the bellows. He saw that there was a little clapper over the hole, in one of the sides of the bellows.
"Is that the valve?" said he to Jonas.