"We may need it!" exclaimed his sister.
"Why—yes, we may," he admitted, though rather grudgingly.
"Then we want to get this fixed," Jessie declared. "But there is something wrong here. Do you see this Darry? It seems to me that there must be a part missing. When you and Burd set this up are you sure you followed the instructions of the book in every particular?"
"Of course we did," Darry said.
"Of course we didn't!" exclaimed Burd's voice from the doorway.
"What are you saying?" demanded his friend, promptly.
"What I know. Don't you remember that you lost the instruction book overboard sometime there, when we were getting the bothersome thing fixed?"
"So I did," confessed Darry. "But, say! she was all right then."
"She hasn't ever been all right," accused his chum, "and you know it."
"We sent code signals by the old machine, all right."