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Sur les Lignes isothermes. (Extrait).
Paris, Crochard, 1817. No wrappers. Extracted from "Annales de Chimie et de Physique, Par MM. Gay-Lussac et Arago.", tome 5, Cahier 1. pp. 102-111 and a large folded engraved plate (Carte des lignes Isothermes par M. A. de Humboldt). In this groundbreaking paper - BEING THE INVENTION OF ISOTHERMS - Humboldt introduced "Isothermes" in meteorology. The offered extract issued simutaneously with the larger memoir which appeared in "Mémoires de physique et de chimie de la Société d'Arcueil" (1817). The engraved map is the first isothermic map ever made. The map covers the major part of the northern hemisphere reaching from America to China. In his own words "Thus we see that circles of equal annual heat, or - to use a new term - isotherms, are not parallel to the equator but - like the magnetic lines - they cut the geographic parallels under a variable angle slantwise." Humboldt's theory of the isothermal lines was based on the diligently applied method of mean values. Many influences contributed to the measured temperature of the air: winds, causing a mixture of temperatures from different latitudes, the proximity of seas or oceans, the inclination, chemical quality, colour, radiation, and exhalation of the soil, the direction of mountain ranges. The old Humboldt claimed only three merits: the geography of plants, the theory of isothermal lines and geomagnetism, and the isotherms as a case study; In the case of the isotherms, Humboldt spoke at great length about errors, limits, and advantages of the method of mean values.
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Last Found On: 2016-08-31           Check availability:      Antikvariat    

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