“Put on that headpiece,” said Jack, motioning.
The other complied.
“By George,” he cried, a moment later.
CHAPTER X
A NIGHT EXPEDITION
For several minutes Jack and Captain Folsom listened with strained attention while through the receivers came to their ears a series of dots and dashes which to one corresponded exactly with the similar sounds picked up by the prohibition enforcement officials on other occasions, and which to the other were meaningless and, therefore, significant.
That statement is not difficult to explain. Jack was familiar with the Morse and Continental codes. What he heard in the receivers represented neither. Therefore, either the station he had picked up and was listening-in on was sending in some mysterious code or, as was more likely, it was radiating control. And, all things considered, the latter was the more likely supposition.
Meanwhile, Bob and Frank, unaware of what was forward, sat disconsolately on the stoop outside in the warm night air, glooming over the damage to their airplane. 86