Abstract
Zeitschrift der Oesterreichischen Gesellschaft für Meteorologie, November 1873.— In order to give warning of approaching storms, an important determination is that of “barometric gradient” between two places, found by ascertaining the difference of atmospheric pressure, and dividing by the distance. But as the places may be at unequal heights above the sea level, the influence of this inequality on the barometric state must first be eliminated. This may be done by either of two methods; reduction to the sea level (the more common way), or determining the divergence of the observed barometric state from the average for several years. At the recent meeting of the International Congress of Meteorology at Vienna, the question came up, which method was preferable; and it was decided, that for stations not more than 300 metres above the sea, the method of reduction had advantages over the other. Dr. Hann here compares the two methods, and presents the grounds of the Congress's decision. Austria adopts, this year, the method recommended, in place of the other.— The paper is followed by one giving a sketch of the organisation for meteorological observations in France, under the direction of M. Le Verrier.— We further note some observations by M. Caloria, of Mailand (communicated to the Istituto Lombardo), comparing the number of sun-spots with the temperature and rainfall during the period 1763–1872. The tables indicate pretty clearly an increase of heat with decrease of spots; though anomalies occur. In rainfall the connection is less marked. Among the other notes will be found information as to the climate of the Philippines, statistics of earthquakes in Austria, meteorites, &c.
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Scientific Serials . Nature 9, 174–175 (1874). https://doi.org/10.1038/009174a0
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DOI: https://doi.org/10.1038/009174a0