File:American engineer and railroad journal (1893) (14758985314).jpg

Identifier: americanengineer69newy (find matches)
Title: American engineer and railroad journal
Year: 1893 (1890s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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m rests upon a certain sup-posed rate of ascent when he became unconscious, and his rateof descent when he recovered consciousness. I have found,however, that a balloon never starts back at. once, eventhough the valve has been pulled ; and for this reason most ofthe time while Glaisher was unconscious was spent in going made in this voyage. This is without doubt the highest ele-vation at which accurate observations have been made, and \v:(S possible in this ease only because of the supply of oxygencarried up. There is a slight misprint in (lie account on page 140, whereit is stated that the mercury in the barometer froze at —80 .Every one knows that mercury freezes at —40 . It seemsstrange that the balloon in this case was filled full of i_as atStarting, as this would necessitate taking up more than 1,000lbs. of ballast, all of which would have to be emptied withsome exertion. If the start had been made with a balloon one-third full, the same height could have been reached without
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HARGRAVES RECENT EXPERIMENTS WITH KITES. horizontally. This is borne out all the more by the fact thatCoxwell, the aeronaut, was paralyzed in all muscles except hisneck, and the slight opening, if any at all, caused by pullingthe rope in his teeth would not release much gas. Here arethe facts : Glaishers last reading before becoming partly unconsciousgave 26,350 ft. as the height, and a temperature of about —4°.A previous reading at 23,380 ft. gave a temperature of 8°.This shows a fall of 8° per 1,000 ft. A very delicate minimumthermometer, which had been accurately tested, gave —12° atthe highest point, and, adding the 2,667 ft. indicated by thisto the previous reading, we have 29,017 ft. as the highest pointattained. Allowing full effect to Glaishers claims, I am surethat the evidence is conclusive that the height was between29.000 ft, and 29,500 ft. Professor Bersons last reading showed the barometer 9.12in. and temperature —54°. If we consider that all the errorsin the

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