A man had the duty to raise a drawbridge to allow the steamers to pass on the river below and to lower it again for trains to cross over on land. One day, this man's son visited him, desiring to watch his father at work. Quite curious, as most boys are, he peeked into a trapdoor that was always left open so his father could keep an eye on the great machinery that raised and lowered the bridge. Suddenly, the boy lost his footing and tumbled into the gears. As the father tried to reach…