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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    [4* ] cuflions of the Air, in a fenfible Tremor and Vibration: Sometimes apparently yield¬ ing and finking under the Violence of an approaching Blaft ; and immediately after, rifing again, upon the Relaxation of it. In Hurricanes and other violent Storms^ befides the Horizontal Blaft, there are often fpiral Eddies and Circumvolutions of the Air working upwards; and evenfometimes railing and carrying Bodies of Weight and Subftance aloft with them. From whence it is obvious to infer, that the Preflure of the Air, muft of confequence be the leaft; downwards; when by fuch a contraryXm« pulfe, it is revers'd and forc'd upwards: And, in this cafe, the Quick-Silver, having no fteady Counterpoife, will be more un¬ fettled, and fink lower than in any other, as in the Storm 1703, above-mention’d. Which is the only Inftance, or Account, I have met with of the Mercury falling below 27 4 Inches. Tho' in fome of thofe unac¬ countable Eddies, that rebound back from the Earth, and feem (pro tempore ) to fuf- pend the Preflure of the Air, by exerting their Force contrary to it; it is very pof- fible that the Vibration, or Subfiding of the Mercury, may be ftill lower. 8. Fro m hence allb we may farther ob- ferve, that fuch an extraordinary Depref- fion of the Mercury, lafts no longer than the Violence of the Storm that caufes it. For F as