“And here we have what you will recognize” Merlin went on, ignoring him in his enthusiasm.
He had a model of a windmill on the same table. He bent down and blew against the sails, and they turned.
“You know the wind makes the sails turn” he said.” Has it never occurred to anyone, that if the sails are made to turn in the other direction, they would push the wind?”
“Push the wind” repeated the knight derisively, but reflecting at the same time that this was really the devil’s work. “You can push the wind can you, old man?”
“Yes, I can push the wind” he said.” Or to be more precise, I can create a wind! And also the sails will push water, for water is just like the wind, except it is thicker. Think of an oarsman rowing a boat, he has to push, then take the oars oat and move them back, th
