various other objects which will be spoken of in due time.
"Well," remarked Tom Swift one afternoon, following a hard day's work in the shop, "I think, if all goes well, and we have good weather, I'll give the Black Hawk a trial tomorrow."
"Do you think it will fly?" asked Ned.
"There is no telling," was the answer of the young inventor. "These things are more or less guesswork, even when you make two exactly alike. As far as I can tell, we have now a better craft than the Red Cloud was, but it remains to be seen how she will behave."
They worked late that night, putting the finishing touches on the Black Hawk, and in the morning the new airship was wheeled out of the shed, and placed on the level starting ground, ready for the trial flight.
Only the bare machinery was in her, as yet, and the gas bag had not been inflated, as Tom wanted to try the plane feature first. But the vapor machine was all ready to start generating the gas whenever it was needed. Nor was the Black Hawk painted and decorated as she would be when ready to be sent to Africa. On the whole, she looked rather crude as she rested there on the bicycle wheels, awaiting the start-
