"Yes—N. A. L.," nodded the tramp.
Dave eyed the speaker keenly. At the distance he was, it was doubtful that he could have dearly made out the monogram, yet he named the letters glibly and correctly.
"N. A. L." stood for the National Aero League. Dave was not a member and neither was Hiram Dobbs. Mr. King was and during the meets it had become the custom with professionals to furnish their assistants with duplicate badges, which enabled them to enter and leave the aero grounds unchallenged by the gateman, and ticket takers.
"You must have pretty good eyes to make out those letters on that badge at a distance," said Dave.
"I've seen them before," readily explained the tramp.
"Oh, you have?"
"Yes, and I've got a badge for sale just like the one you're wearing."
CHAPTER XII
DAVE'S DISCOVERIES
"You have got a badge like mine for sale, you say?" exclaimed Dave.