Tom and his father looked to where Eradicate pointed, and saw a strange sight.  A small biplane-airship had become entangled in some of the aerials of Tom’s wireless apparatus, and the craft had turned turtle, being held from falling by some of the wire braces.

The birdman had fallen out, but had managed to cling to the chimney, so that he had not reached the ground, and there he clung, while the motor of his airship was banging away, and revolving the propeller blades dangerously close to his head.

“Are you hurt?” cried Tom, to the unknown birdman.

“No, but I’m likely to be unless I get out of here!” was the gasped-out answer.

“Hold fast!” cried Tom.  “We’ll have you down in a jiffy.  Here, Rad, you get the long ladder.  Where’s Koku?  That giant is never around when he’s wanted.  Find Koku, Rad, and send him here.”

“Yas, sah, Massa Tom; directly, sah!” and the colored man hastened off as fast as his aged legs would take him.

And while preparations are thus under way to rescue the birdman from the roof, I will take just a few minutes to tell you a little something more about Tom Swift and his numerous inventions, as set forth in the previous books of this series.

“Tom Swift and His Motor Cycle” was the first book, and in that I related how Tom made the acquaintance of a Mr. Wakefield Damon, of the neighboring town of Waterford, and how Tom bought that gentleman’s motor cycle, after it had tried to climb a tree with its rider in the saddle.  Mr. Wakefield Damon was an odd man, whose favorite expression was “Bless my shoelaces!” or something equally absurd.  Waterford was not far from Shopton, where Tom and his father made their home.

Mr. Swift was also an inventor of note, and Tom soon followed in his father’s footsteps.  They lived in a large house, with many shops about it, for their work at times required much machinery.

Mrs. Baggert was the housekeeper who looked after Tom and his father, and got their meals, when they consented to take enough time from their inventive work to eat.  Another member of the household was Eradicate Sampson, a genial old colored man, who said he was named Eradicate because he used to eradicate the dirt about the place.

Koku, just referred to by Tom, was an immense man, a veritable giant, whom Tom had brought back with him from one of his trips, after escaping from captivity.  The young inventor really brought two giants, brothers they were, but one had gone to a museum, and the other took service with our hero, making himself very useful when it came to lifting heavy machinery.

Tom had a close friend in Ned Newton, who was employed in the Shopton bank.  Another friend was Miss Mary Nestor, a young lady whose life Tom had once saved.  He had many other friends, and some enemies, whom you will meet from time to time in this story.