rectly after I have sent out a call, and it has been picked up by some operator. Still there is a possibility that some operator might receive my message, and report to his chief, or some one in authority over him, before replying. In that time I might go away. But to guard against that I will sleep with the telephone receiver clamped to my ear. Then I can hear the answer come over the wires, and can jump up and reply."
"Do you mean you will sleep here?" asked Mr. Damon, indicating the shack where the wireless apparatus was contained.
"Yes," answered Tom, simply.
"Can't we take turns listening for the answer?" inquired Mr. Fenwick, "and so relieve you?"
"I'm afraid not, unless you understand the Morse code," replied Tom. "You see there may be many clicks, which result from wireless messages flying back and forth in space, and my receiver will pick them up. But they will mean nothing. Only the answer to our call for help will be of any service to us."
"Do you mean to say that you can catch messages flying back and forth between stations now?" asked Mr. Fenwick.
"Yes," replied the young inventor, with a smile. "Here, listen for yourself, and he passed the
