Some considerations on the causes of earthquakes. Which were read before the Royal Society, April 5, 1750 / By Stephen Hales.

  • Hales, Stephen, 1677-1761.
Date:
1750
Catalogue details

Licence: Public Domain Mark

Credit: Some considerations on the causes of earthquakes. Which were read before the Royal Society, April 5, 1750 / By Stephen Hales. Source: Wellcome Collection.

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    Air nearly equal to what frefh Air was let in, will be deftroyed, which is evident by the riling up of the Water in the Neck of the Glafs almoft as high as before. And if after the Effervefcence of the mixed Airs •! •» r ' ■»i is over, and become clear again, frefh Air be admitted as before, they will again grow reddifh and turbid, and deftroy the new ad¬ mitted Air as before $ and that after feveral repeated Admiflions of Air. But after each * Readmiffion of frefti Air, the Quantity de- ; ! flroyed will be lefs and lefs, till no more will be deftroyed. And it is the fame af¬ ter ftanding feveral Weeks, provided in the mean Time too much frefh Air had nof been admitted. Now I found the Sum to- . > > « , • tal of the frefh Air thus deftroyed to be nearly equal to the firft Quantity of the fulphureous Air, in the inverted Glafs. Since we have in this Experiment, a full Proof of the brifk Agitation and Effervefcence, which arifes from the Mixture of frefh Air, with Air that is impregnated with fulphure¬ ous Vapours, which are raifed from feveral * ^ * * * . „ t I * * 4 < * mineral