One week later the two men had everything ready. That night, as quietly as possible, they moved to a position behind a fence near the skyrocket launching racks. Dr. Morton was carrying a compass, a flashlight, and a small clinometer; Harvey was struggling with two large skyrockets. He whispered, "What if we miss or they go off too soon, or something?"

"Nonsense, Harvey," said Dr. Morton. He busied himself with the flashlight and compass, and carefully aimed one of the rockets. "You forget I am a physicist." He then aimed the other rocket and checked elevation with the clinometer. "The ............