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.

    26/112 (page 14)
    Mountain, and the perpendicular Heigl of the Mountain it felf to be 1000 Yard then it will follow, that as 3 .to 27 tl: Height of the Mercury^ fo 1000 Yards, tf Height of the Mountain, to 9000 Yards th Height of the Atmojphere, which is muc the fame with the other Computatioi being about five Miles and five Eights i Height. H o w little the Proportion here allottee of 1000 Yards to 3 Inches Fall in the Met cury, varies from the Truth, appears fror hence that Mr. Cajfwell (a noted Matherm tician of Oxford) meafuFd Snowdon Hill i North-Wales (reputed the highefl: Mountai in Brittain) and found it to be 1240 Yard high ; and the celebrated Dr. Halley aftei wards, by feveral exa£t Tryals, at the Foe and Top of the Mountain, found the Me? cury to defeend three Inches and eigb Tenths of an Inch. Vide Harris's Lexicon Barometer. Derham's Ajlrotheology, page 114 and 115. From whence it follows, that the Fal of the Mercury one tenth Part of an Inch is very near equivolent to 32 Yards anc two Feet; the Fall of the Mercury one Inch is equivolent to 326 Yards two Feet, anc the Fall of the Mercury three Inches, h equivolent to 980 Yards. These Computations, it muft be owm’d are not entirely exaft and acurate, norindeec ' \ capa