Ebook How It Flies, or the Conquest of the Air

The Ships of the Air. He has explained the laws of their ?ight; sketched their development to the pres ent day; shown how to build the ?ying machine and the balloon, and how to operate them; recounted what man has done, and what he hopes to do with their aid. In a word, all the essential facts that enter into the Conquest of the Air have been gath ered into orderly form, and are here presented -to.