"THE APPARENT CONCAVITY OF THE EARTH AS SEEN FROM A BALLOON.-A perfectly-formed circle encompassed the visibly planisphere beneath, or rather the concavo-sphere it might now be called, for I had attained a height from which the earth assumed a regularly hollowed or concave appearance-an optical illusion which increases as you recede from it. well known to sea-going travellers that nothing more need be said in its support but the appearance from a balloon is only familiar to a very few observers, and therefore it will be useful to quote the words of some of those who have written upon the subject. He seems to be in the centre of a large concavity-a vast watery basin-the circular edge of which expands or contracts as he takes a higher or lower position. If he takes a position where the water surrounds him-as, on the deck or the mast-head of a ship out of sight of land, or on the summit of an island far from the mainland-the surface of the sea appears to rise up on all sides equally, and to surround him like the walls of an immense amphitheatre. 25, H, H, the sea horizon, which rises and falls with the observer, and is always on a level with his eye. If a good plane mirror be held vertically in the opposite direction, the horizon will be reflected as a well defined mark or line across the centre, as represented in fig.
Sea, the surface appears as a vast inclined plane rising up from beneath us, until in the distance it reaches the level of the eye, and intercepts the line-of-sight. If we stand upon the deck of a ship, or mount to the mast-lead, or ascend above the earth in a balloon and look over the Sacred Texts Earth Mysteries Index Previous Next Experiments Demonstrating the True Form of Standing Water, and Proving the Earth to be a Plane: Experiment 10 Zetetic Astronomy, Earth Not A Globe: Chapter II.
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