An historical and philosophical account of the barometer, or, weather-glass. Wherein the reason and use of that instrument, the theory of the atmosphere, and the causes of its different gravitation, are assign'd and explain'd. And a modest attempt from thence made towards a rational account and probable judgment of the weather / By Edward Saul.

  • Saul, Edward, 1677-1754
Date:
1735
Catalogue details

Licence: Public Domain Mark

Credit: An historical and philosophical account of the barometer, or, weather-glass. Wherein the reason and use of that instrument, the theory of the atmosphere, and the causes of its different gravitation, are assign'd and explain'd. And a modest attempt from thence made towards a rational account and probable judgment of the weather / By Edward Saul. Source: Wellcome Collection.

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    L 17 ] alfo we may farther obferve, That the par¬ ticular Effett the Winds have upon the Changes of the Weather, depend, in a great meafure, upon the prefent State and Quality of the Atmofphere ; for when that is moift and damp, or charg’d with Clouds and Va¬ pours, the Change of the Wind into an op- pofite Quarter loon produces Rain : But when the Jtmo/phere is clear and free from Vapours, it adds to the Weight and Quantity of the Air j a,id, by that means, continues and prolongs fair Weather. a. To fuch an Accumulation of Air as we have above-mention'’d, may very proba¬ bly be afcrib’d the conftant and fettled Dry- nefs of the Coafts of 'Peru and Chili; where from 3 to 30 Degrees South, and for ia or 13 Degrees to the Weft, according to Dam¬ per, and other Travellers, it never rains. To account for this, it is obfervable, that a conftant Eajl Wind blows round the Globe for fcveral Degrees on each fide of the yEquator; that the Andes in Peru and Chili (being a Ridge of the higheft Mountains in the World, and running from North to South ) lie directly crofs to the general Cur¬ rent of the Air; and thereby, either break, or intercept the Clouds and Vapours on the Eajlern fide of the Mountains ; or elfe raifc and accumulate the Air on the Weftern fide, to fuch an Height and Quantity, as to fup- port the Vapours floating in it to the Dift- ance of 250 or 300 Leagues from the Shore; where