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Weather Warnings for Watchers

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Book Excerpt: 
. . .f the whole earth—only 1/3388th part; extend the calculation to rain, as well as dew, the average fall of which on the whole earth is estimated at five feet annually, or twelve times greater; and then estimate the sum of 4,000,000 × 3,388 × 12 = 162,624,000,000 tons, or about 3,000 times as much as is annually raised in the whole world; and we have the number of tons of coal required to produce the heat expended by the sun merely in raising vapour from the sea to give us rain during a single day.”

1.
Pouillet’s Pyrheliometer. Scale about 1/8.

SOLAR RADIATION.

Seeing, then, that solar radiation plays so important a part in the production of the natural phenomena classed under the head of Meteorology, a description of the mode of estimating its amount will prove interesting, and enable the reader to realize the existence of this mighty power. M. Pouillet devised for this purpose the apparatus know. . . Read More