"No interference?" queried Del Mar, adjusting the apparatus.
The man shook his head in the negative.
"We must get a quenched spark apparatus," went on Del Mar, pleased that nothing was wrong here. "This rotary gap affair is out of date. By the way, I want you to be ready to send a message, to be relayed across to our people. I've got to consult the board below in the harbor, first, however. I'll send a messenger to you."
"Very well, sir," returned the man, saluting as Del Mar went out.
Out at Fort Dale, Lieutenant Woodward was still entertaining his new friend, Professor Arnold, and had introduced him to Colonel Swift, the commanding officer at the Fort.
They were discussing the strange events of the early morning, when an orderly entered, saluted Colonel Swift and handed him a telegram. The Colonel tore it open and read it, his face growing grave. Then he handed it to Woodward, who read:
WASHINGTON, D. C.
Radio station using illegal wave length in your vicinity. Investigate and report.
BRANDON,
Radio Bureau.