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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    [ 5* ] rious Changes in the Gravitation of the Air ; and thofe again upon the Quantity of Clouds and Vapours floating above; and upon the different Quarters, Degrees, Temper and Oppofition of the Winds. And tho’ I dare not fay that all the Changes of the Barometer, depending upon thofe of the Jtmofphere, are clearly account¬ able for by thele Principles; yet they cer¬ tainly anfwer in fo many Inltances, that a ftricter Attention to them, and Application of them, might perhaps go a great way in explaining thofe few of which, by their feeming Inconfiftency, or Irregularity, we find Reafon to be diffident. Thus I have fometimes wonder’d at the Mercury riling in a warm, moift Southerly Wind ; but after a few Hours Sufpenfe, an Eaft, or Northerly Wind, driving above, has prevail’d over the South Wind below, and reconcil’d the Rife of the Gla/sy to the Weight of the Airy and the State of the Weather. Sometimes alfo, in the like Cafe, when there has been no fuch apparent Op- pofition of Winds, I have fufpected, either the Spring of the Air exerting it felf in a more than ordinary manner ; or that the Upper Regions of the Atmofphere, being more cold and condens’d, have difcharg’d their Weight upon the Lower; and thereby caus’d the Rife of the Mercury, tho* the warm rarefy’d Air near the Surface of the Earth,