AN HISTORIC VISIT - Allen Elementary School students stare up at Benjamin Franklin (a.k.a. Robert Bray) Thursday morning as American history comes to life right before their eyes. At left, Bray listens to a question but has to ask the questioner to speak up. 'You have to talk loud,' he says, 'these ears are 285 years old.' Your favorite invention Mr. Franklin? 'My favorite invention is right on my nose,' he says, referring to his bifocal eye glasses. Do you play sports, Mr. Franklin? 'What's a sport?... I was a good swimmer. In fact my first invention was shingles that I attached to my feet. You call them flippers.'