The boys were always much together, but of late their association had become still closer because of their common interest in the wonders of the wireless telephone. The marvelous features of this great invention had caught fast hold of their youthful imaginations, and they were soon so much absorbed in it that almost everything else was forgotten, or at least had to take second place.

Two things happened at almost the same time that increased their enthusiasm in this subject. One was a talk given to them on radio discoveries by Dr. Amory Dale, the pastor of the Old First Church of Clintonia, who had a scientific turn of mind and was most keenly interested in radio. The inspiration he gave them by his talk, together with practical object lessons on the making of radio sets, had an importance that could hardly be overestimated.

Shortly after this the member of Congress from the district in which Clintonia was included, Mr. Ferberton, offered prizes open for competition to all the boys of the district for the best radio sets made by the boys themselves. As the first prize was for a hundred dollars and the second for fifty, they were well worth trying for, and Bob, Joe, and Jimmy set to work in earnest to win one of them. Herb, owing to his natural indolence, did not enter into the competition, a circumstance that he afterward regretted.

They had a good many troubles and misadventures about this time, owing chiefly to the malice of Buck Looker, a bully of the town, who, together with his cronies, Carl Lutz and Terry Mooney, almost as bad as himself, did all they could to hinder the radio boys in their plans. Jimmy’s set was stolen by them on one occasion and on another Bob detected Buck trying to destroy his aerial at night, and gave the bully the trouncing that he richly deserved.

A curious accident that happened in the town opened to the boys a mystery that seemed difficult of solution and set their feet on the path of exciting adventures. How they rescued a girl whose automobile had run wild and dashed through the windows of a store, what they learned of her story and how they got on the track of a rascal who had swindled her, and what part the radio played in the unraveling of the plot, are narrated in the first book of this series, entitled: “The Radio Boys’ First Wireless; Or, Winning the Ferberton Prize.”

It did not take Joe long to recover from the shock he had had when he found himself suspended in midair over the rocks that had been gathered for the repairing of the foundation of the barn. Bob’s danger also had been great, and all felt that they had reason for being profoundly grateful over the happy outcome of the adventure.

“You just came in time, fellows,” said Bob. “Joe is no featherweight, and my arm was getting numb. A minute or two more and we’d both have had a tumble that I hate to think about.”

“That shows what good judgment we had in picking just the right time to come,” replied Jimmy, winking slily at Herb. “It takes some brains to be Johnny-on-the-spot just when you’re needed. Not a minute too late, not a minute too soon——that’s my motto.”

“I’ll admit that you took good care not to get here too soon,” replied Bob, with a laugh. “Where have you been all the afternoon? Why did you leave Joe and me to hold the bag?”

“Look at his pockets and you’ll find the answer,” said Joe, pointing to suspicious bulges in Jimmy’s jacket pockets.