"Hooray!" shouted Bud, as he finished jotting down the last sentence.

"There are three amateurs, one in Clayton, N.Y., one in Rockport and
one in Gananoque, Ontario, who have radio compasses and they worked
together to locate the fellow on the island," continued the informant
with the eagerness of fraternal interest and generosity. "I will give
you their calls--"

The message was interrupted by a strong spark, which could not be
ignored. Sender Number one stopped sending, and Hal gave ear to the
new message.

"I will save you the trouble," read the dots and dashes evidently
addressed to the operator he had just "crowded out," "I am at Rockport
and am one of the three radio compass boys referred to. I can supply the
dope right now."

Hal threw over the aerial switch and flashed the one word "Shoot!" Then
he swung back again and all three boys listened eagerly.

"Have you a good map of the Thousand Island region?" inquired the loop
aerial operator.

"Yes," Hal replied.

"Well, take these directions and then draw the line on the map. Draw one
line from Clayton, N.Y., northeast, 47-1/2 degrees from perpendicular;
another from Rockport, Ontario, southeast, 11 degrees from
perpendicular; another from Gananoque, southeast, 76 degrees from
perpendicular. The intersection of those lines will indicate the island