“I’ll tell you what I’ll do,” said Joe thoughtfully. “I know a moving picture operator, who’s an old friend of mine and who’d be glad, if I asked him, to do me a favor. I’ll get him to come down some day and take a picture of the ball in motion. Then we’ll study out the film and I think I can prove to you that the ball _does_ curve on its way from the pitcher to the catcher.”