The engine was designed only for auxiliary purposes, and the boiler was intended to use coal, of which they found an ample supply in the northern portion of the island, as explained in a previous book.
When the boys returned to their rooms late that afternoon, the first thing that interested them was the message. When it was brought in it was dry, and a slight change was noticed in its appearance. Now, what appeared to be the first word of the message, was discernible, the word "Take," and the word "Head" could be made out before and as a part of "land," in the second line.
"We have it," cried Harry, as he jumped up. "Now let them know about it."
They were across the open space, without any ceremony, and without taking trouble to announce themselves, were in the Professor's room.
"We have it,—we have made it out," was the announcement, as Harry held up the message.
"Does it tell you where the Copper mine is located?" asked the Professor.
"Copper mine!" exclaimed George. "What has a copper mine to do with it?"
"John and I concluded, from certain markings on the paper, that it contained a diagram of the mine!"
"Well, you were mistaken," said Harry with a chuckle. "It is something about an island, thirty leagues to the southeast, somewhere."