were being made, was doubly locked, and Jackson, the engineer, who was also a sort of watchman, was bidden to keep good guard, for the fear of the gang of unscrupulous men, who had escaped from jail during a great storm, was still in the minds of Mr. Swift and his son.
"And give an occasional look in the shed, where the aeroplane is," advised Mr. Sharp. "It wouldn't take much to damage that, now."
"I'll pay particular attention to it," promised the engineer. "Don't worry, Mr. Sharp."
After supper the three gathered around the table on which were spread out sheets of paper, covered with intricate figures and calculations, which Mr. Swift and the balloonist went over with care. Tom was examining some blue prints, which gave a sectional view of the proposed ship, and was making some measurements when the bell rang, and Mrs. Baggert ushered in Ned Newton, the most particular chum of the young inventor.
"Hello, Ned!" exclaimed Tom. "I was wondering what had become of you. Haven't seen you in a dog's age."
"That's right," admitted Ned. "We've been working late nights at the bank. Getting ready for the regular visit of the examiner, who usually comes along about this time. Well, how are
