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 like 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 Mr. Jackson, Tom went to the engine room. There was a
little delay, due to the fact that some adjustment was necessary on
the main motor. But at last it was fixed.

"Are you all ready?" called Tom.