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Updated: May 11, 2025
There is every prospect that the State will be rapidly filled with a population that believes in freedom and in the dignity of labor. She has an advantage over the other ex-slave States, in lying west of the populous regions of the North. Hitherto, emigration has generally followed the great isothermal lines, as can be readily seen when we study the population of the Western States.
This unequal distribution of land and water has the greatest influence on the distribution of heat over the surface of the globe, on the inflexions of the isothermal lines, and the climateric phenomena in general.
But these temporary effects would be insignificant compared with the permanent ones. The currents of the Atlantic and Pacific would be altered in their directions and amounts. The distribution of heat achieved by those ocean currents would be different from what it is. The arrangement of the isothermal lines, not only on neighbouring continents, but even throughout Europe, would be changed.
The West, with its growing millions vigorously working out the problem of free labor, and of Republicanism, will inevitably control the Mississippi river and master the destinies of all soil above the so-called isothermal line, and probably of much below it.
But what gives epochal character to the paper is the introduction of those isothermal lines circling the earth in irregular course, joining together places having the same mean annual temperature, and thus laying the foundation for a science of comparative climatology. It is true the attempt to study climates comparatively was not new.
Oh, that depends a good deal on latitude and longitude. Epithets follow the isothermal lines pretty accurately.
Along each isothermal or climatic band were its correspondingly modified men, spending their lives in avocations dictated by their environment. These strands of population were destined to be dislocated, and some of them to become extinct, by inventing or originating among themselves new and unsuitable artificial physical conditions.
He drew his isothermal lines not where some occult calculation would locate them on an ideal globe, but where practical tests with the thermometer locate them on our globe as it is. London, for example, lies in the same latitude as the southern extremity of Hudson Bay; but the isotherm of London, as Humboldt outlines it, passes through Cincinnati.
Though such disturbances are comparatively insignificant in the motions of the planets, yet in the weather they are often more important than the primary causes. The aggregate and permanent effect of all these disturbing causes, primary and secondary, is seen in that irregular distribution of climates, which the tortuous isothermal lines and the mottled raincharts illustrate.
The chief claim for this water piston compressor is that its piston is also its cooling device, and that the heat of compression is absorbed by the water. So much confidence seems to be placed in the isothermal features of this machine that usually no water jacket or spray pump is applied. Mr.
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