ing of the big propellers. As the stores and supplies were not yet in, Tom took aboard, in addition to Mr. Damon, Ned, his father, Mr. Jackson and Mr. Durban, some bags of sand to represent the extra weight that would have to be carried.
"If she'll rise with this load she'll do," announced the young inventor, as he went carefully over the craft, looking to see that everything was in shape.
"If she does rise it will be a new experience for me," spoke the old elephant hunter. "I've never been in an airship before. It doesn't seem possible that we can get up in the air with this machine."
"Maybe we won't," spoke Tom, who was always a little diffident about a new piece of machinery.
"Well, if it doesn't do it the first time, it will the second, or the fifty-second," declared Ned Newton. "Tom Swift doesn't give up until he succeeds."
"Stop it! You'll make me blush!" cried the Black Hawk's owner as he tried the different gages and levers to see that they were all right.
After what seemed a long time he gave the word for those who were to make the trial trip to take their places. They did so, and then, with
