"Oh, look at the fireworkth!" cried Tommy out loud. "The thhip ith on
fire!"
Harriet laid a firm hand on her arm. "Keep still!"
A faint squealing sound was now distinguishable, while the sparking
at the masthead continued with almost rhythmic regularity.
"I know! I know what it is!" gasped Harriet excitedly. "Listen, Tommy,
listen. Don't you know?"
CHAPTER XIX
SAILING THE BLUE WATER
"No, I don't know what it ith. If I did, I thhouldn't be athking you,"
answered Grace. "It ith either lightning, fireworkth or a real fire."
"It is wireless, Tommy. Don't you know now?"
Grace shook her head.
"Didn't you ever hear a wireless machine work?"
"No; but there ithn't any wireleth on the 'Thilly Thue,' ith there?"
"I--I don't know. I mean, I did not see any when we were out there
to-day. I don't understand it. What can he be doing with wireless so
late at night?"
"Maybe he ith telegraphing home to find out if the folkth are all
right," suggested Tommy.
Harriet did not smile. Her face was very grave, her forehead wrinkled
in thought. For the greater part of an hour, with brief intervals
between, the wireless on the sloop continued, the sparks at the
masthead sputtering and snapping with marked regularity.
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