. The Family tutor . [Zacharia of Rosleben conceived that it would be possible to construct a flyingboat, and, as an experiment, he made a case of light wood, covered with linen, in theshape of a flat obtuse-angled keel, five and a half feet in diameter, and half a foot deep,weighing fourteen and a half pounds. He launched this machine from a scaffoldtwenty-seven feet high, which was erected on a rock one hundred feet above the race-course of Wendelstein, upon the 17th of September 1822, and the boat flew ]5ofeet. He made another experiment upon the same day, and from the same spot, withanothe
. The Family tutor . [Zacharia of Rosleben conceived that it would be possible to construct a flyingboat, and, as an experiment, he made a case of light wood, covered with linen, in theshape of a flat obtuse-angled keel, five and a half feet in diameter, and half a foot deep,weighing fourteen and a half pounds. He launched this machine from a scaffoldtwenty-seven feet high, which was erected on a rock one hundred feet above the race-course of Wendelstein, upon the 17th of September 1822, and the boat flew ]5ofeet. He made another experiment upon the same day, and from the same spot, withanother boat, weighing twenty-five pounds, which landed after a flight of 158 experiments were not repeated on account of the expense and their partial failure.—Abridged from the Elements of Nat. Philosophy by Prof. Viest, of Anhalt-Dessau, p. 208.] In virtue of its elasticity, atmospheric air is the common medium for the transmis-sion of sounds. Under the receiver of an air-pump, let there be placed a bell, a,.
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