South American Exploration
Whymper next organized an expedition to Ecuador, designed primarily to collect data for the study of altitude sickness and the effect of reduced pressure on the human body. His chief guide was Jean-Antoine Carrel, who later died from exhaustion on the Matterhorn after bringing his employers into safety through a snowstorm.
During 1880, Whymper made two ascents of Chimborazo (6,267m), also claiming the first ascent. He spent a night on the summit of Cotopaxi and made first ascents of half a dozen other great peaks. In 1892, he published the results of his journey in a volume entitled Travels amongst the Great Andes of the Equator.
His observations on altitude sickness led him to conclude that it was caused by a reduction in atmospheric pressure, which lessens the value of inhaled air, and by expansion of the air or gas within the body, causing pressure upon the internal organs. The effects produced by gas expansion may be temporary and dissipate when equilibrium has been restored between the internal and external pressure. The publication of his work was recognized on the part of the Royal Geographical Society by the award of the Patron's medal.
His experiences in South America having convinced him of certain serious errors in the readings of aneroid barometers at high altitudes, he published a work entitled How to Use the Aneroid Barometer and succeeded in introducing important improvements in their construction. He afterwards published two guide books to Zermatt and Chamonix.
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