Stories of inventors and discoverers in science and the useful arts. A book for old and young (1860)
Timbs, John, 1801-1875 · New York, Harper & Brothers · leaf 119
rom the metropolis, were, the altitude of the horizon,which remained practically on a level with the eye at an elevation oftwo miles, causing the surface of the earth to appear concave insteadof convex, and to recede during the rapid ascent, while the horizonand the balloon seemed to be stationary:…
Inventions · Inventors
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