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Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1839 Excerpt: ... eminent in modern theories of the earth, as serving to explain the phenomena of earthquakes, of volcanoes and the eruption of lava, the cause of the permanent high temperature of thermal springs, &c. The fact that the temperature of the earth increases as we descend towards its centre, was ascertained nearly a century ago, by observing with the thermometer at successively increasing depths; but it was only some time after, that the important question to which this fact gives rise engaged the serious attention of philosophers, and took a proper direction. Observations tending to confirm the fact have been made in the principal mines of Europe, in France, Germany, and England. In Mexico, Humboldt was enabled to determine the temperature of the mines of that country, to the depth of 1713 English feet. The following are the principal consequences deduced from the experiments that have so far been made: 1. In all places where observations with the thermometer have been made beneath the invarialle stratum, there is no known exception to the rule that the temperature increases with the depth. 2. Beneath the invariable stratum, the temperature peculiar to each stratum along the same vertical line is likewise invariable. 3. The proportion in which the temperature increases with the depth is often very different in different localities. The reason of this is readily found in the various causes that modify the distribution of heat throughout the dissimilar mineral strata of the globe. Enough is already known, however, to allow it to be stated approximately that to obtain an increase of 1 centigrade, it is necessary to penetrate from 82 to 98 feet below the stratum under examination. If we take the data furnished by the observations made in the cellars of the Royal Obs...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1839 Excerpt: ... eminent in modern theories of the earth, as serving to explain the phenomena of earthquakes, of volcanoes and the eruption of lava, the cause of the permanent high temperature of thermal springs, &c. The fact that the temperature of the earth increases as we descend towards its centre, was ascertained nearly a century ago, by observing with the thermometer at successively increasing depths; but it was only some time after, that the important question to which this fact gives rise engaged the serious attention of philosophers, and took a proper direction. Observations tending to confirm the fact have been made in the principal mines of Europe, in France, Germany, and England. In Mexico, Humboldt was enabled to determine the temperature of the mines of that country, to the depth of 1713 English feet. The following are the principal consequences deduced from the experiments that have so far been made: 1. In all places where observations with the thermometer have been made beneath the invarialle stratum, there is no known exception to the rule that the temperature increases with the depth. 2. Beneath the invariable stratum, the temperature peculiar to each stratum along the same vertical line is likewise invariable. 3. The proportion in which the temperature increases with the depth is often very different in different localities. The reason of this is readily found in the various causes that modify the distribution of heat throughout the dissimilar mineral strata of the globe. Enough is already known, however, to allow it to be stated approximately that to obtain an increase of 1 centigrade, it is necessary to penetrate from 82 to 98 feet below the stratum under examination. If we take the data furnished by the observations made in the cellars of the Royal Obs...
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