Meanwhile Tom and his friends were very busy over the Black Hawk.
Every hour saw the craft nearer completion, for the young inventor
had had much experience in this sort of work now, and knew just how
to proceed.

To Mr. Damon were intrusted certain things which he could well
attend to, and though he frequently stopped to bless his necktie or
his shoelaces, still he got along fairly well.

There would be no necessity of purchasing supplies in this country,
for they could get all they needed in the African city of Majumba,
on the western coast, where they planned to land. There the airship
would be put together, stocked with provisions and supplies, and
they would begin their journey inland. They planned to head for Buka
Meala, crossing the Congo River, and then go into the very interior
of the heart of the dark continent.

As we have described in detail, in the former books of this series,
the construction of Tom Swift's airship, the Red Cloud, and as the
Black Hawk was made in a similar manner to that, we will devote but
brief space to it now. As the story proceeds, and the need arises
for a description of certain features, we will give them to you, so
that you will have a clear idea of what a wonderful craft it was.

Sufficient to say that there was a gas bag, made of a light but
strong material, and capable of holding enough vapor, of a new and
secret composition, to lift the airship with its load. This was the
dirigible-balloon feature of the craft, and with the two powerful
propellers, fore and aft (in which particular the Black Hawk
differed from the Red Cloud which had two forward propellers);--with