Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 24
practical fact is that normal humanlife cannot exist above the level of 15,000 feet,or a little less than three miles; and navigationof the air will doubtless be carried on at a muchlower altitude, for reasons which will appear as wecoutiuTie. The actual weight of a definite quantity of dryair—for… … Upper limit of atmosphere, 38 miles. UnknownRegion. Highest point reached by im.manned sound-ing balloon, IS miles. Highest point reached by manned balloon, 35.500 feet.Mt. Everest, Himalaya Mts., 29,002 feet. Mt. McKinley, 20,480 feet.Mt. Blanc, 15,810 feet. Hospice of St. Bernard,habitation.…
Aeronautics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Catalogue des monuments et inscriptions de l'Égypte antique / publié sous les auspices de S.A. Abbas II Helmi par la direction générale du Service des antiquités [de l'Égypte] ; par J. de Morgan, U. Bouriant, G. Legrain, G. Jéquier, A. Barsanti (1894)](https://img.insideoutlibrary.com/img/200/ia-cataloguedesmonu31egyp-31-52.webp)
