Climatography of the Salt River Valley region of Arizona, the land of health and sunshine . o residents of that section, and somewhat imper-fectly realized in other portions of the country, that thesensation of heat as experienced by animal life, is notaccurately measured by the ordinary thermometer. Thesensation of temperature which we usually refer to the con-dition of the atmosphere depends not only on the tempera-ture of the air, but also on its dryness, the velocity of thewind, and other circumstances. The human organism,when perspiring freely, evaporates the moisture of its sur-face and

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Climatography of the Salt River Valley region of Arizona, the land of health and sunshine . o residents of that section, and somewhat imper-fectly realized in other portions of the country, that thesensation of heat as experienced by animal life, is notaccurately measured by the ordinary thermometer. Thesensation of temperature which we usually refer to the con-dition of the atmosphere depends not only on the tempera-ture of the air, but also on its dryness, the velocity of thewind, and other circumstances. The human organism,when perspiring freely, evaporates the moisture of its sur-face and Stock Photo
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https://www.alamy.com/licenses-and-pricing/?v=1 https://www.alamy.com/climatography-of-the-salt-river-valley-region-of-arizona-the-land-of-health-and-sunshine-o-residents-of-that-section-and-somewhat-imper-fectly-realized-in-other-portions-of-the-country-that-thesensation-of-heat-as-experienced-by-animal-life-is-notaccurately-measured-by-the-ordinary-thermometer-thesensation-of-temperature-which-we-usually-refer-to-the-con-dition-of-the-atmosphere-depends-not-only-on-the-tempera-ture-of-the-air-but-also-on-its-dryness-the-velocity-of-thewind-and-other-circumstances-the-human-organismwhen-perspiring-freely-evaporates-the-moisture-of-its-sur-face-and-image342953408.html
Climatography of the Salt River Valley region of Arizona, the land of health and sunshine . o residents of that section, and somewhat imper-fectly realized in other portions of the country, that thesensation of heat as experienced by animal life, is notaccurately measured by the ordinary thermometer. Thesensation of temperature which we usually refer to the con-dition of the atmosphere depends not only on the tempera-ture of the air, but also on its dryness, the velocity of thewind, and other circumstances. The human organism,when perspiring freely, evaporates the moisture of its sur-face and
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Image ID: 2AWXTG0
Climatography of the Salt River Valley region of Arizona, the land of health and sunshine . o residents of that section, and somewhat imper-fectly realized in other portions of the country, that thesensation of heat as experienced by animal life, is notaccurately measured by the ordinary thermometer. Thesensation of temperature which we usually refer to the con-dition of the atmosphere depends not only on the tempera-ture of the air, but also on its dryness, the velocity of thewind, and other circumstances. The human organism,when perspiring freely, evaporates the moisture of its sur-face and thus lowers its temperature. The meteorologicalinstrument that registers the temperature of evaporation,and thus, in a great measure, the actual heat felt by thehuman body, is the wet-bulb thermometer. The latter, asindicated by its name, is simply an ordinary mercurialthermometer, whose bulb is wetted with water at the timeof observation. Chart I has been constructed to show the average actualand sensible temperature of Weather Bureau stations in theUnited States for the summer season.. / 45 The broad principle illustrated by this chart is that thegreatest differences between shade and sensible temperaturesare round where the air is the driest, and the least wherethe air is most humid. A glance at the chart is sufficientto show the general trend of the lines of equal air and sen-sible temperatures. The great interior valleys and theplains east of the foothills of the Rocky Mountains areuniformly heated under the insolation of summer to an aver-age of from 65°on the northern boundary, to about 80° onthe Gulf Coast. The northern portion of this vast extentof country is, moreover, in the path of atmospheric disturb-ances that pass from west to east over our northern boun-daries, thus causing an indraught of warm, moist air fromlower latitudes. Again, the distribution of atmosphericpressure over the eastern two-thirds of the United Statesis at times such as to cause a more or le

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