John Harrison was a carpenter. He lived in the . He built a clock. The clock was made of wood. The clock did not need oil. The clock worked well on land. Harrison wanted the prize. The prize was twenty thousand pounds. The money was for a way to find longitude at sea. Harrison took his clock on a ship. The ship went to Lisbon. The clock was accurate. The clock told the time. The sailors found their way.
Harrison went to the Board of Longitude. He asked for the money. The Board did not give him the money. They said the clock was lucky. They said the trial was not long enough. Harrison went home. He worked more. He built a second clock. He built a third clock. He built a fourth clock. The fourth clock was small. It looked like a watch. Harrison was an old man. He had worked for . The work was hard. The reward did not come. The King had to help him. Harrison got the money when he was . The effort did not match the speed of the reward.
Counting Tiles in the Dark
I
