Uncle Robert took out his watch. It was ten minutes past eight.
"That is Susie's time," he said. "Would it be the same in New York,
Frank?"
"I think it would be past that," said Frank, "but I don't know how much."
"It is ten minutes past nine by the watch in New York," said Uncle
Robert.
"When would it be that time in Denver?" asked Donald.
"In an hour by the watch," said Uncle Robert, "but it would not be the same by the sun."
"Then the watches don't tell the true time, do they?" said Frank.
"The sun's shadows give us the true time," said Uncle Robert. "We will study the shadows, and by and by may learn how the watches and clocks are regulated. But how do you think people told the time before they had clocks?"
"It must have been by the sun," replied Frank.
"I can tell by the sun when it is noon," said Donald, "but I don't see how any one can tell any other hour that way."