An historical and philosophical account of the barometer, or weather-glass ... And a modest attempt from thence made towards a rational account and probable judgement of the weather / By Edw. Saul, A.M.

  • Saul, Edward, 1677-1754.
Date:
1730
Catalogue details

Licence: Public Domain Mark

Credit: An historical and philosophical account of the barometer, or weather-glass ... And a modest attempt from thence made towards a rational account and probable judgement of the weather / By Edw. Saul, A.M. Source: Wellcome Collection.

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    down to the Surface of the Earth; and elaftic, or fpringy, becaufe the Particles of the Air9 like Wool, are capable of Contradion and Dilatation ; capable of being comprefs’d within a narrower Compafs by any in¬ cumbent Weight, and of reftoring and ex¬ panding themfelves again, upon the Abatement, or Removal of it. A n d as thefe two Properties, the Weight and Spring of the Air, have a mutual Con¬ nection and Dependance upon each other, and contribute jointly in producing the Effeds obfervable in the Barometer ; fo to avoid the Confulion of arguing from two different Principles, I fhall confider them both under one common View, in the fequel of this Difcourfe, and by the Preffure of the Air, the Gravitation of the Atmofphere, and other fynonimous Expreffions, I wou’d be here underftood to mean, not the Weight of the Air diftind from the Spring of the Air; but the compound Effed (as they both Ad in Conjundion) refulting from both, and as for the particular Effeds of the Spring of the Air, fo far as they are necef- fary, and bear a Relation to this Subjed, they will be confider’d and explain’d in their proper Place. As the general Gravitation of the Air upon the Surface of the Earth, has been much the fame in all Ages of the World, and the Effeds proceeding from it, conftant B 2 and