Weather Foreknowledge; Theoretical and Practical Contributions Towards Its Acquisition - Softcover

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.1866 Excerpt: ... WEATHER FOREKNOWLEDGE. The study of meteorology discloses that the temperature, moisture, and wind motion of the atmosphere do not remain constant and unvariable over any one region of the earth, but that they are subject to fluctuations generated by seasonable, local, and accidental influences. The seasonable variations are of two kinds. The first is caused by the continuous shifting of the radiant intensity of the sun's force during its progress north and south during the year. Thus, from the 21st December to the 21st June, the intensity of the sun's rays naturally declines in the southern hemisphere, and accumulates in the northern; whilst from the 21st June to the 21st December, the intensity decreases in the northern and increases in the southern hemisphere. Although these are the natural turning points of the sun's greatest intensity and laxity, still the actual. positions of extreme heat and is cold do occur after the dates given, because of induced motions in the earth's atmosphere, and by reason of the capability the earth has of slowly accumulating and of as slowly parting with its heat. The second seasonable variation is only a minutely fractional part of the first, and is due to the rotation of the earth upon its axis; and therefore as the year is the greater seasonable variation, the day is the relatively less. As the year hath its two points of greatest heat and cold, so hath the day. During the seasonable fluctuations of the year, the day continuously exhibits the exertion of a force which is relatively subordinate to the time of the year. The term seasonable is therefore appropriately applied both to the periods of the year and the hours of tbe day. Local fluctuations of the atmosphere are those which have reference to the latitude, altitude...

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