Miscellanea curiosaContaining a collection of some of the principal phaenomena in nature, accounted for by the greatest philosophers of this age; being the most valuable discourses, read and delivered to the Royal Society, for the advancement of physical and mathematical knowledgeAs also a collection of curious travels, voyages, antiquities, and natural histories of countries; presented to the same society . Mifcellanea Curiofa. 81 A Dijcourfe of the Rule of the De-creafe of the height of the Mer-cury in the Barometer^ accordingas Places are elevated above theSurface of the Earth ; with anAtte
Miscellanea curiosaContaining a collection of some of the principal phaenomena in nature, accounted for by the greatest philosophers of this age; being the most valuable discourses, read and delivered to the Royal Society, for the advancement of physical and mathematical knowledgeAs also a collection of curious travels, voyages, antiquities, and natural histories of countries; presented to the same society . Mifcellanea Curiofa. 81 A Dijcourfe of the Rule of the De-creafe of the height of the Mer-cury in the Barometer^ accordingas Places are elevated above theSurface of the Earth ; with anAttempt to difcover the true Rea-fon of the Rifing and Falling ofthe Mercury, upon Change ofWeather. By Edm. Halley. TP H E Elaftlck Property of the Air hasX been long fmce made out, by Experimentsbefore the Society% and elfewhere ; and the Refinance of its Spring is found to be near*ly equal to the Weight or Force that compre£fes it; as alfb, that the Spaces the fame Air oc-cupies, under differing Preflures, are recipro-cally as thofe Preffiires: It has been (hewn like-wife by undoubted Experiment, that the fpeci-fick Gravity of the Air, near the Earths Sur-face to that of Water, was once as i to 840 •again as 1 to 8?x; and a third time, in a verylarge VefTel holding 10 Gallons, as 1 to 860 •all which, confidering the Difficulty of the Ex-periment, agree well enough, the Mercury (land-ing at all th
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